A fast light-responsive liquid crystal elastomer actuator and preparation method thereof

Abstract

The present invention provides a fast light-responsive liquid crystal elastomer actuator and a preparation method thereof, and belongs to a liquid crystal elastomer actuator in the technical field of polymer materials. The liquid crystal elastomer actuator is a uniformly oriented single-domain high entropy alloy liquid crystal polymer, which is obtained by uniformly stretching a multi-domain high entropy alloy liquid crystal polymer in the longitudinal direction and then initiating photopolymerization by ultraviolet light; the multi-domain high entropy alloy liquid crystal polymer contains dispersed high entropy alloys, which are obtained by cross-linking liquid crystal monomers; the fast light-responsive liquid crystal elastomer actuator presents a hollow radially symmetrical structure. The fast light-responsive liquid crystal elastomer actuator of the present invention has a full solar spectrum absorption response function, excellent plasticity and self-recovery, and a simple manufacturing process, integrating sensing, driving and built-in feedback loops, and has high light tracking accuracy and adaptive phototropism, providing a new technical approach for the research and development of intelligent soft robots.

Description

Technical Field

[0001] The invention relates to a liquid crystal elastomer actuator belonging to the technical field of polymer materials, and in particular to a fast light-responsive liquid crystal elastomer actuator and a preparation method thereof. Background Art

[0002] Liquid crystal elastomer materials are formed by moderate cross-linking of non-cross-linked liquid crystal polymers, and can show elasticity in an isotropic state or a liquid crystal state. Liquid crystal elastomer actuators combine the orientation of liquid crystals and the scalability of elastomers. They can respond to external stimuli such as light, heat, and electricity, thereby changing their shape or stiffness. They are a type of polymer material that can respond to external stimuli. Due to their unique deformation characteristics and flexible applications, they have broad application prospects in the fields of intelligent soft robots, wearable devices, and artificial muscles. Traditional liquid crystal elastomer actuators usually rely on thermoinduced phase change to achieve response, but the temperature control method is inefficient and difficult to achieve local and real-time control. Light as a stimulus source can not only achieve rapid response, but also has the advantages of non-contact, easy control, and environmental protection. Therefore, using light as a driving source for liquid crystal elastomer actuators has become a trend. Light-responsive liquid crystal elastomer actuators usually introduce materials with photothermal conversion capabilities into polymer networks, such as semiconductor materials, precious metal materials, carbon-based materials, etc., so that the materials can efficiently absorb light energy and convert it into heat energy, thereby achieving shape changes. However, the price of photothermal conversion materials, the light response band, and poor compatibility with the mechanism may affect the driving performance and mechanical properties of the actuator. Therefore, it is of great research significance and application potential to prepare liquid crystal elastomer actuators with full-band light responsiveness, plasticity, and self-recovery by simple and effective means.

[0003] High entropy alloy nanoparticles are alloys formed by five or more metals in equal or approximately equal amounts, showing high thermal stability, uniform crystal structure, controllable nanoparticle size, and adjustable element composition. d - d The transition orbits have different absorption wavelengths. By rationally selecting the constituent elements, efficient light absorption in the full-band spectrum range from 250nm to 2500nm can be achieved. This characteristic gives high-entropy alloy nanoparticles broad application prospects in the fields of photothermal conversion and smart materials. Therefore, a self-healing actuator with excellent mechanical properties and no obvious separation interface can be constructed as a composite of photothermal conversion materials and liquid crystal elastomer materials to achieve full-band rapid light response. This design scheme will help overcome the limitations of traditional photoresponsive materials in the light absorption band, pave the way for the widespread application of liquid crystal elastomers, and show great application potential in fields that require rapid response, remote operation and multifunctional control.

[0004] At present, regarding the preparation method of photoresponsive liquid crystal elastomer actuators based on photothermal materials, Chinese patent CN116376027A discloses a photoresponsive polysiloxane liquid crystal elastomer and its preparation method, and Chinese patent CN115785668A discloses a photoresponsive dynamic liquid crystal elastomer driver material and its preparation method; however, this type of elastomer actuator has two disadvantages: (1) it cannot absorb the entire solar spectrum (250nm-2500nm); (2) the photothermal conversion efficiency is low, and it cannot achieve rapid phototropism and rapid recovery.

[0005] High entropy alloy nanoparticles are based on their unique dd The transition characteristics show excellent absorption capacity within the range of the entire solar spectrum (250nm-2500nm), which enables it to have efficient photothermal conversion performance. It also shows excellent thermal stability under high temperature environment. These characteristics provide a wide range of possibilities for its application in the fields of photothermal drive, solar thermal conversion, etc., and help to develop more efficient and durable light-responsive materials. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a fast light-responsive liquid crystal elastomer actuator and a preparation method thereof. The core purpose is to simplify the process flow and prepare a light-responsive actuator with excellent response speed in the full solar spectrum in an efficient and convenient manner, thereby significantly improving its application performance.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a fast light-responsive liquid crystal elastomer actuator, which is a uniformly oriented single-domain high-entropy alloy liquid crystal polymer, obtained by uniformly stretching a multi-domain high-entropy alloy liquid crystal polymer in the longitudinal direction and then initiating photopolymerization by ultraviolet light; the multi-domain high-entropy alloy liquid crystal polymer contains dispersed high-entropy alloys, which are obtained by cross-linking liquid crystal monomers;

[0009] The fast light-response liquid crystal elastomer actuator is a hollow radially symmetrical structure.

[0010] Furthermore, the high entropy alloy is composed of Fe, Ni, Ti, Cr and Mn elements in equal molar ratios.

[0011] Furthermore, the liquid crystal monomer is 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257).

[0012] The present invention also provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0013] Step 1: preparing high entropy alloy nanoparticles;

[0014] Step 2: dissolving the liquid crystal monomer in an organic solvent, heating until the liquid crystal monomer is fully dissolved and then cooling to room temperature, adding the high entropy alloy nanoparticles prepared in step 1, and uniformly mixing to obtain a precursor solution;

[0015] Step 3: adding a crosslinking agent, a spacer, a photoinitiator and a catalyst to the precursor solution of step 2, vortex stirring and uniformly mixing to obtain a high entropy alloy liquid crystal elastomer solution;

[0016] Step 4: injecting the high entropy alloy liquid crystal elastomer solution in step 3 into the mold to carry out polymerization reaction, and demoulding after the reaction is completed to obtain an initial multi-domain high entropy alloy liquid crystal polymer;

[0017] Step 5: volatilize and dry the organic solvent of the initial multi-domain high entropy alloy liquid crystal polymer in step 4 to obtain a multi-domain high entropy alloy liquid crystal polymer, i.e., a multi-domain high entropy alloy liquid crystal elastomer;

[0018] Step 6: uniformly stretching the multi-domain high entropy alloy liquid crystal polymer obtained in step 5 in the longitudinal direction, and then performing ultraviolet-induced photopolymerization using a photoinitiator to form a single-domain high entropy alloy liquid crystal polymer with uniform orientation, i.e., a single-domain high entropy alloy liquid crystal elastomer;

[0019] Step 7: Cool the single-domain high entropy alloy liquid crystal elastomer in step 6 to obtain a fast light-responsive liquid crystal elastomer actuator.

[0020] Furthermore, in step 1 of a method for preparing a fast light-responsive liquid crystal elastomer actuator, a method for preparing high entropy alloy nanoparticles comprises the following steps:

[0021] Step 1: Using high-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders as raw materials, with an average particle size of 45 μm; using a mechanical alloying method, using an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary, preparing high-entropy alloy micro-sheets in an equal molar ratio, and pressing the micro-sheets into a cylindrical shape;

[0022] Step 2: After adjusting the vacuum arc furnace to an oxygen-free atmosphere, the cylindrical high-entropy alloy in step 1 is added into the vacuum chamber of the arc furnace in sequence; when the vacuum degree is reduced, the reaction gas H2 and the inert gas Ar are introduced into the cavity, and the arc discharge process is maintained for 5min-30min for melting to ensure that the high-entropy alloy is made into nanoparticles; the cooling plate is set to 7℃-10℃ to obtain a non-equilibrium synthesis process, and the high-entropy alloy nanoparticles are collected after passivation for 6h-12h.

[0023] Furthermore, in step 2 of the method for preparing a fast light-responsive liquid crystal elastomer actuator, the organic solvent is toluene, methyl chloride, methanol or acetone;

[0024] The weight ratio of liquid crystal monomer to high entropy alloy nanoparticles in the precursor solution is 100:(1-5);

[0025] The heating process is carried out on a constant temperature heating plate, the heating temperature is 40°C-130°C, and the heating time is 5min-10min.

[0026] Further, in step 3 of a method for preparing a fast light-responsive liquid crystal elastomer actuator, the crosslinking agent is pentaerythritol tetrakis-(3-mercaptopropionate) (PETMP), the spacer is 2,2-(ethylenedioxy)diethylmercaptan (EDDET), the photoinitiator is Irgacure-651 (DMPA), and the catalyst is dipropylamine (DPA);

[0027] The vortex stirring time is 1 min-5 min, and the uniform mixing is carried out by continuous ultrasonic mixing for 5 min-10 min to obtain a high entropy alloy liquid crystal elastomer solution.

[0028] Furthermore, in step 4 of the method for preparing a fast light-responsive liquid crystal elastomer actuator, the polymerization reaction is a thiol-acrylate click reaction carried out at room temperature, and the reaction time is 6h-24h;

[0029] Furthermore, in step 5 of the method for preparing a fast light-responsive liquid crystal elastomer actuator, the organic solvent volatilization and drying process is to place the actuator in an oven at 50° C.-120° C. until the solvent is completely volatilized.

[0030] Furthermore, in step 6 of a method for preparing a fast light-responsive liquid crystal elastomer actuator, the multi-domain high entropy alloy liquid crystal polymer is uniformly stretched in the longitudinal direction to 150%-300% of the original length, and the ultraviolet light intensity is 40 mW / cm 2 -100mW / cm 2 The irradiation time is 5min-40min.

[0031] The present invention provides an application of a fast light-responsive liquid crystal elastomer actuator in the field of intelligent soft robots.

[0032] The high entropy alloy nanoparticles with full spectrum absorption performance of the present invention are precisely selected metal elements so that the 3 d The energy band is located near the Fermi level, thereby realizing photothermal conversion in full-spectrum sunlight response, and constructing a self-healing fast-light-responsive liquid crystal elastomer actuator with excellent mechanical properties and no obvious separation interface. The fast-light-responsive liquid crystal elastomer actuator has an absorption rate of up to 96% for sunlight, showing excellent phototaxis, and providing a new technical approach for the research and development of intelligent soft robots.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The high entropy alloy nanoparticles provided by the present invention are highly compatible with the liquid crystal elastomer matrix and can be photopolymerized in situ in the liquid crystal elastomer matrix to form a polymer network. This method significantly enhances the mechanical properties and photoactuated properties of the material, making the actuator more suitable for multifunctional applications in dynamic environments.

[0035] 2. The hollow radially symmetrical structure design of the fast light-responsive liquid crystal elastomer actuator of the present invention can effectively delay radial heat conduction, thereby giving the actuator fast light response and excellent light response behavior. This structure helps the actuator to achieve fast and uniform deformation when absorbing light energy, and converts light energy into mechanical energy more efficiently.

[0036] 3. The fast light-responsive liquid crystal elastomer actuator of the present invention integrates sensing, driving and a built-in feedback loop, and has high light tracking accuracy and adaptive phototropism.

[0037] 4. The fast light-responsive liquid crystal elastomer actuator of the present invention has the function of absorbing and responding to the entire solar spectrum, has excellent plasticity and self-recovery, and has a simple manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 1 is a transmission electron microscope (TEM) image of the high entropy alloy nanoparticles in Example 1 of the present invention, wherein: (a) is a bright field image of the high entropy alloy nanoparticles, (b) is a surface scan of the Fe element, (c) is a surface scan of the Ni element, (d) is a surface scan of the Ti element, (e) is a surface scan of the Cr element, and (f) is a surface scan of the Mn element;

[0039] Figure 2 is an X-ray photoelectron spectroscopy (XPS) graph of the high entropy alloy nanoparticles in Example 1 of the present invention;

[0040] Figure 3 is an X-ray diffraction (XRD) diagram of the high entropy alloy nanoparticles in Example 3 of the present invention;

[0041] Figure 4 1 is a wide angle X-ray diffraction (WAXD) diagram of the liquid crystal elastomer actuator in Example 3 of the present invention and optical photographs before and after stretching, wherein: (a) is a WAXD diagram before stretching, (b) is an optical photograph before and after stretching, and (c) is a WAXD diagram after stretching;

[0042] Figure 5 is an azimuth diagram of a multi-domain high entropy alloy liquid crystal polymer and a single-domain liquid crystal polymer in Example 3 of the present invention;

[0043] Figure 6It is a differential scanning calorimetry (DSC) graph of the single-domain liquid crystal elastomer actuator in Comparative Example 1 of the present invention and the fast light-responsive liquid crystal elastomer actuator in Example 3, wherein: LCE is a single-domain liquid crystal elastomer actuator, and HEA-LCE is a fast light-responsive liquid crystal elastomer actuator;

[0044] Figure 7 It is an X-ray diffraction (XRD) diagram of the high entropy alloy nanoparticles in Example 3 of the present invention, the fast light-responsive liquid crystal elastomer actuator in Example 3, and the single-domain liquid crystal elastomer in Comparative Example 1, wherein: HEA is a high entropy alloy nanoparticle, LCE is a single-domain liquid crystal elastomer actuator, and HEA-LCE is a fast light-responsive liquid crystal elastomer actuator;

[0045] Figure 8 It is an absorption spectrum curve diagram of the high entropy alloy nanoparticles in Example 3 of the present invention, the fast light-responsive liquid crystal elastomer actuator in Example 3, and the single-domain liquid crystal elastomer in Comparative Example 1, wherein: HEA is a high entropy alloy nanoparticle, LCE is a single-domain liquid crystal elastomer actuator, and HEA-LCE is a fast light-responsive liquid crystal elastomer actuator;

[0046] Fig. 9 It is the response curve of the monodomain liquid crystal elastomer in comparative example 1 of the present invention and the fast light-response liquid crystal elastomer actuator in embodiment 3 under irradiation of 808nm infrared laser at an incident angle of 60°, wherein: LCE is a monodomain liquid crystal elastomer actuator, and HEA-LCE is a fast light-response liquid crystal elastomer actuator;

[0047] Fig.10 are optical photographs of the bending process of the fast light-responsive liquid crystal elastomer actuator in Example 3 of the present invention under 808 nm infrared laser irradiation, wherein: (a) is the bending angle at 0 s, (b) is the bending angle at 3 s, (c) is the bending angle at 5 s, and (d) is the bending angle at 14 s;

[0048] Fig.11 This is the actuation cycle performance of the fast light-responsive liquid crystal elastomer actuator in Example 3 of the present invention. DETAILED DESCRIPTION

[0049] The technical scheme and technical effects of the present invention are described in detail below in conjunction with specific embodiments and drawings. Experimental methods without specifying specific conditions are usually based on conventional conditions, such as the conditions described in textbooks and experimental guides, or the conditions recommended by manufacturers, which are well known or easily known to ordinary technicians in the field. The following embodiments are only preferred embodiments of the present invention and do not limit the present invention. For those skilled in the art, the present invention can have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0050] In order to solve the problems of short response band, small response amplitude, poor compatibility with mechanism and the like of light-responsive materials in existing liquid crystal elastomer actuators, the present invention prepares a liquid crystal elastomer actuator with rapid light response to the entire solar spectrum by adding high entropy alloy nanoparticles as photothermal materials and liquid crystal elastomers.

[0051] The present invention provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0052] Step 1: Using high-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders as raw materials, the average particle size is about 45μm. Using the mechanical alloying method, in an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary, high-entropy alloy micro-sheets are prepared in an equimolar ratio, and the micro-sheets are pressed into a cylindrical shape; after the vacuum arc furnace is adjusted to an oxygen-free atmosphere, the cylindrical high-entropy alloy is added to the vacuum chamber of the arc furnace. When the vacuum degree drops to 5×10 -3 After Pa, the reaction gases H2 and Ar are introduced into the chamber, and the arc discharge process lasts for 5min-30min to carry out smelting to ensure that the high entropy alloy micro-flakes are made into nanoparticles; the cooling plate is set at 7℃-10℃ to obtain a non-equilibrium synthesis process to promote the growth of high entropy alloy nuclei to form nanoparticles; passivation treatment is carried out to make the nanoparticle powder settle, and after passivation for 6h-12h, the high entropy alloy nanoparticles are collected;

[0053] Step 2: 0.5g-5g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) is dissolved in 0.1g-1g of toluene, and heated to 40°C-130°C on a hot plate for 5min-10min, and cooled to room temperature; then 0.005g-0.05g of high entropy alloy nanoparticles are added, and ultrasonic mixing is performed to obtain a precursor solution;

[0054] Step 3: Add 0.02g-0.2g of pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) as a crosslinker, 0.11g-1.1g of 2,2-(ethylenedioxy)diethylmercaptan (EDDET) as a spacer, 0.003g-0.03g of Irgacure651 (DMPA) as a photoinitiator, and 0.0015g-0.015g of a catalyst dipropylamine (DPA) to the precursor solution, vortex-stir for 1min-5min and ultrasonically mix for 5min-10min to obtain a high entropy alloy liquid crystal elastomer solution;

[0055] Step 4: Add the high entropy alloy liquid crystal elastomer solution into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid the generation of bubbles. After the reaction is completed, demolding is performed to obtain an initial multi-domain high entropy alloy liquid crystal polymer with a hollow radially symmetrical structure;

[0056] Step 5: placing the initial multi-domain high entropy alloy liquid crystal polymer in an oven at 50° C.-120° C. for more than 6 hours until the solvent is completely volatilized, thereby obtaining a multi-domain high entropy alloy liquid crystal elastomer;

[0057] Step 6: After the multi-domain high entropy alloy liquid crystal elastomer is stretched uniformly along the longitudinal direction to 150%-300% of its original length, the light intensity is 40mW / cm 2 -100mW / cm 2 Perform photopolymerization under ultraviolet light for 5 min to 40 min to obtain a single-domain high entropy alloy liquid crystal polymer, i.e., a single-domain high entropy alloy liquid crystal elastomer;

[0058] Step 7: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0059] The present invention is further described below in conjunction with specific embodiments and accompanying drawings:

[0060] Example 1

[0061] The present invention provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0062] Step 1: Prepare high entropy alloy nanoparticles. The specific steps are as follows:

[0063] High-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders were used as raw materials, with an average particle size of about 45 μm. High-entropy alloy micro-sheets were prepared in an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary material in an equimolar ratio by mechanical alloying method, and the micro-sheets were pressed into cylindrical shapes. After the vacuum arc furnace was adjusted to an oxygen-free atmosphere, the cylindrical high-entropy alloy was added into the vacuum chamber of the arc furnace. When the vacuum degree was reduced to 5×10 -3 After Pa, the reaction gas H2 and the inert gas Ar were introduced into the chamber, and the reaction voltage was adjusted to 66V and the reaction current was adjusted to 230A for smelting. The arc discharge process lasted for 30 minutes to ensure that the high-entropy alloy micro-flakes were made into nanoparticles. The cooling plate was set at 10°C to obtain a non-equilibrium synthesis process. After passivation for 6 hours, the high-entropy alloy nanoparticles were collected.

[0064] Step 2: 0.5 g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) was dissolved in 0.1 g of toluene and heated to 40°C on a constant temperature heating plate for 10 min until the liquid crystal monomer was fully dissolved and cooled to room temperature. Subsequently, 0.005 g of high entropy alloy nanoparticles was added and ultrasonically mixed to obtain a precursor solution.

[0065] Step 3: Add 0.02g of crosslinking agent pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) (tetrathiol crosslinking monomer), 0.11g of spacer 2,2-(ethylenedioxy)diethylthiol (EDDET) (dithiol monomer), 0.003g of photoinitiator Irgacure651 (DMPA) and dissolve them into the solution. DMPA is a photoinitiator used to achieve the second stage photopolymerization reaction and 0.0015g of catalyst dipropylamine (DPA) to the precursor solution of step 2, and then vigorously mix the solution on a vortex mixer for 1min; then continuously ultrasonically mix for 5min, and after mixing evenly, obtain a high entropy alloy liquid crystal elastomer solution;

[0066] Step 4: inject the high entropy alloy liquid crystal elastomer solution in step 3 into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid the generation of bubbles, and carry out a thiol-acrylate click reaction at room temperature for 6 hours, and then demold to obtain an initial multi-domain high entropy alloy liquid crystal polymer with a hollow radially symmetrical structure; Step 5: place the initial multi-domain high entropy alloy liquid crystal polymer in a 50°C oven for 24 hours to obtain a multi-domain high entropy alloy liquid crystal elastomer;

[0067] Step 6: After the multi-domain high entropy alloy liquid crystal elastomer is stretched to 150% of its original length by a uniform external force in the longitudinal direction, the light intensity is 40mW / cm 2 The single-domain high entropy alloy liquid crystal polymer, i.e., single-domain high entropy alloy liquid crystal elastomer, was obtained by photopolymerization under ultraviolet light for 40 minutes.

[0068] Step 7: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0069] Example 2

[0070] The present invention provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0071] Step 1: Prepare high entropy alloy nanoparticles. The specific steps are as follows:

[0072] High-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders were used as raw materials with an average particle size of 45 μm. High-entropy alloy micro-sheets were prepared in an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary by mechanical alloying method in an equimolar ratio, and the micro-sheets were pressed into cylindrical shapes. After the vacuum arc furnace was adjusted to an oxygen-free atmosphere, the cylindrical high-entropy alloy was added into the vacuum chamber of the arc furnace. When the vacuum degree was reduced to 5×10 -3 After Pa, the reaction gas H2 and the inert gas Ar were introduced into the chamber, and the reaction voltage was adjusted to 88V and the reaction current was adjusted to 300A for smelting. The arc discharge process lasted for 25 minutes to ensure that the high-entropy alloy micro-flakes were made into nanoparticles. The cooling plate was set to 8°C to obtain a non-equilibrium synthesis process. After passivation for 8 hours, the high-entropy alloy nanoparticles were collected.

[0073] Step 2: 2 g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) was dissolved in 0.4 g of methyl chloride and heated to 60°C on a constant temperature heating plate for 9 minutes until the liquid crystal monomer was fully dissolved and cooled to room temperature. Subsequently, 0.04 g of high entropy alloy nanoparticles was added and ultrasonically mixed to obtain a precursor solution.

[0074] Step 3: Add 0.08g of crosslinking agent pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) (tetrathiol crosslinking monomer), 0.44g of spacer 2,2-(ethylenedioxy) diethyl mercaptan (EDDET) (dithiol monomer), 0.012g of photoinitiator Irgacure651 (DMPA) and dissolve them into the solution. DMPA is a photoinitiator used to achieve the second stage photopolymerization reaction and 0.006g of catalyst dipropylamine (DPA) to the precursor solution of step 2, and then vigorously mix the solution on a vortex mixer for 2min; then continuously ultrasonically mix for 6min, and after mixing evenly, obtain a high entropy alloy liquid crystal elastomer solution;

[0075] Step 4: inject the high entropy alloy liquid crystal elastomer solution in step 3 into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid the generation of bubbles, and perform a thiol-acrylate click reaction at room temperature for 8 hours, and then demold to obtain an initial multi-domain high entropy alloy liquid crystal polymer with a hollow radially symmetrical structure;

[0076] Step 5: placing the initial multi-domain high entropy alloy liquid crystal polymer in an oven at 70° C. for 22 hours to obtain a multi-domain high entropy alloy liquid crystal elastomer;

[0077] Step 6: After the multi-domain high entropy alloy liquid crystal elastomer is stretched to 180% of its original length by a uniform external force in the longitudinal direction, the light intensity is 60mW / cm 2The single-domain high entropy alloy liquid crystal polymer, i.e., single-domain high entropy alloy liquid crystal elastomer, was obtained by photopolymerization under ultraviolet light for 35 minutes.

[0078] Step 7: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0079] Example 3

[0080] The present invention provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0081] Step 1: Prepare high entropy alloy nanoparticles. The specific steps are as follows:

[0082] High-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders were used as raw materials, with an average particle size of about 45 μm. High-entropy alloy micro-sheets were prepared in an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary material in an equimolar ratio by mechanical alloying method, and the micro-sheets were pressed into cylindrical shapes. After the vacuum arc furnace was adjusted to an oxygen-free atmosphere, the cylindrical high-entropy alloy was added into the vacuum chamber of the arc furnace. When the vacuum degree was reduced to 5×10 -3 After Pa, the reaction gas H2 and the inert gas Ar were introduced into the chamber, and the reaction voltage was adjusted to 90V and the reaction current was adjusted to 370A for smelting. The arc discharge process lasted for 20 minutes to ensure that the high-entropy alloy micro-flakes were made into nanoparticles. The cooling plate was set to 9°C to obtain a non-equilibrium synthesis process. After passivation for 10 hours, the high-entropy alloy nanoparticles were collected.

[0083] Step 2: 3 g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) was dissolved in 0.6 g of toluene and heated to 60°C on a constant temperature heating plate for 9 minutes until the liquid crystal monomer was fully dissolved and cooled to room temperature. Subsequently, 0.09 g of high entropy alloy nanoparticles was added and ultrasonically mixed to obtain a precursor solution.

[0084] Step 3: Add 0.12g of crosslinking agent pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) (tetrathiol crosslinking monomer), 0.66g of spacer 2,2-(ethylenedioxy) diethyl mercaptan (EDDET) (dithiol monomer), 0.018g of photoinitiator Irgacure 651 (DMPA) and dissolve them into the solution. DMPA is a photoinitiator used to achieve the second stage photopolymerization reaction and 0.009g of catalyst dipropylamine (DPA) to the precursor solution of step 2, and then vigorously mix the solution on a vortex mixer for 3min; then continuously ultrasonically mix for 8min, and after mixing evenly, obtain a high entropy alloy liquid crystal elastomer solution;

[0085] Step 4: inject the high entropy alloy liquid crystal elastomer solution in step 3 into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid generating bubbles, and perform a thiol-acrylate click reaction at room temperature for 10 hours, followed by demolding to obtain an initial multi-domain high entropy alloy liquid crystal polymer with a hollow radially symmetrical structure;

[0086] Step 5: placing the initial multi-domain high entropy alloy liquid crystal polymer in an oven at 90° C. for 20 hours to obtain a multi-domain high entropy alloy liquid crystal elastomer;

[0087] Step 6: After the multi-domain high entropy alloy liquid crystal elastomer is stretched to 220% of its original length by a uniform external force in the longitudinal direction, the light intensity is 70mW / cm 2 The single-domain high entropy alloy liquid crystal polymer, i.e., single-domain high entropy alloy liquid crystal elastomer, was obtained by photopolymerization under ultraviolet light for 25 minutes.

[0088] Step 7: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0089] Example 4

[0090] The present invention provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0091] Step 1: Prepare high entropy alloy nanoparticles. The specific steps are as follows:

[0092] High-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders were used as raw materials, with an average particle size of about 45 μm. High-entropy alloy micro-sheets were prepared in an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary material in an equimolar ratio by mechanical alloying method, and the micro-sheets were pressed into cylindrical shapes. After the vacuum arc furnace was adjusted to an oxygen-free atmosphere, the cylindrical high-entropy alloy was added into the vacuum chamber of the arc furnace. When the vacuum degree was reduced to 5×10 -3 After Pa, the reaction gas H2 and the inert gas Ar were introduced into the chamber, and the reaction voltage was adjusted to 100V and the reaction current was adjusted to 440A for smelting. The arc discharge process lasted for 15 minutes to ensure that the high-entropy alloy micro-flakes were made into nanoparticles. The cooling plate was set to 8°C to obtain a non-equilibrium synthesis process. After passivation for 11 hours, the high-entropy alloy nanoparticles were collected.

[0093] Step 2: 4 g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) was dissolved in 0.8 g of acetone and heated to 100 ° C on a constant temperature heating plate for 7 minutes. The liquid crystal monomer was fully dissolved and cooled to room temperature. Then, 0.16 g of high entropy alloy nanoparticles was added and ultrasonically mixed to obtain a precursor solution.

[0094] Step 3: Add 0.16g of crosslinking agent pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) (tetrathiol crosslinking monomer), 0.88g of spacer 2,2-(ethylenedioxy) diethyl mercaptan (EDDET) (dithiol monomer), 0.024g of photoinitiator Irgacure651 (DMPA) and dissolve them into the solution. DMPA is a photoinitiator used to achieve the second stage photopolymerization reaction and 0.012g of catalyst dipropylamine (DPA) to the precursor solution of step 2, and then vigorously mix the solution on a vortex mixer for 4min; then continuously ultrasonically mix for 9min, and after mixing evenly, obtain a high entropy alloy liquid crystal elastomer solution;

[0095] Step 4: inject the high entropy alloy liquid crystal elastomer solution in step 3 into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid the generation of bubbles, and perform a thiol-acrylate click reaction at room temperature for 12 hours, and then demold to obtain an initial multi-domain high entropy alloy liquid crystal polymer with a hollow radially symmetrical structure;

[0096] Step 5: placing the initial multi-domain high entropy alloy liquid crystal polymer in an oven at 110° C. for 18 hours to obtain a multi-domain high entropy alloy liquid crystal elastomer;

[0097] Step 6: After the multi-domain high entropy alloy liquid crystal elastomer is stretched to 260% of its original length by a uniform external force in the longitudinal direction, the light intensity is 90mW / cm 2 Photopolymerization was performed under ultraviolet light for 15 minutes to obtain a single-domain high entropy alloy liquid crystal polymer, i.e., a single-domain high entropy alloy liquid crystal elastomer;

[0098] Step 7: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0099] Example 5

[0100] The present invention provides a method for preparing a fast light-responsive liquid crystal elastomer actuator, comprising the following steps:

[0101] Step 1: Prepare high entropy alloy nanoparticles. The specific steps are as follows:

[0102] High-purity (≥99.9%) Fe, Ni, Ti, Cr and Mn powders were used as raw materials, with an average particle size of about 45 μm. High-entropy alloy micro-sheets were prepared in an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary material in an equimolar ratio by mechanical alloying method, and the micro-sheets were pressed into cylindrical shapes. After the vacuum arc furnace was adjusted to an oxygen-free atmosphere, the cylindrical high-entropy alloy was added into the vacuum chamber of the arc furnace. When the vacuum degree was reduced to 5×10 -3After Pa, the reaction gas H2 and the inert gas Ar were introduced into the chamber, and the reaction voltage was adjusted to 100V and the reaction current was adjusted to 500A for smelting. The arc discharge process lasted for 5 minutes to ensure that the high-entropy alloy micro-flakes were made into nanoparticles. The cooling plate was set at 10°C to obtain a non-equilibrium synthesis process. After passivation for 12 hours, the high-entropy alloy nanoparticles were collected.

[0103] Step 2: Dissolve 5 g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) in 1 g of methanol and heat to 130°C on a constant temperature heating plate for 5 min until the liquid crystal monomer is fully dissolved and cooled to room temperature. Then, add 0.25 g of high entropy alloy nanoparticles and mix evenly by ultrasonication to obtain a precursor solution.

[0104] Step 3: Add 0.2g of crosslinking agent pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) (tetrathiol crosslinking monomer), 1.1g of spacer 2,2-(ethylenedioxy)diethylthiol (EDDET) (dithiol monomer), 0.03g of photoinitiator Irgacure651 (DMPA) and dissolve them into the solution. DMPA is a photoinitiator used to achieve the second stage photopolymerization reaction and 0.015g of catalyst dipropylamine (DPA) to the precursor solution of step 2, and then vigorously mix the solution on a vortex mixer for 5min; then continuously ultrasonically mix for 10min, and after mixing evenly, obtain a high entropy alloy liquid crystal elastomer solution;

[0105] Step 4: inject the high entropy alloy liquid crystal elastomer solution in step 3 into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid the generation of bubbles, and perform a thiol-acrylate click reaction at room temperature for 24 hours, and then demold to obtain an initial multi-domain high entropy alloy liquid crystal polymer with a hollow radially symmetrical structure;

[0106] Step 5: placing the initial multi-domain high entropy alloy liquid crystal polymer in an oven at 120° C. for 6 hours to obtain a multi-domain high entropy alloy liquid crystal elastomer;

[0107] Step 6: After the multi-domain high entropy alloy liquid crystal elastomer is stretched to 300% of its original length by a uniform external force in the longitudinal direction, the light intensity is 100mW / cm 2 Photopolymerization was performed under ultraviolet light for 5 minutes to obtain a single-domain high entropy alloy liquid crystal polymer, i.e., a single-domain high entropy alloy liquid crystal elastomer;

[0108] Step 7: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0109] Comparative Example 1

[0110] A method for preparing a liquid crystal elastomer actuator, wherein the liquid crystal elastomer does not contain high entropy alloy nanoparticles, comprises the following steps:

[0111] Step 1: 3 g of liquid crystal monomer 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene (RM257) was dissolved in 0.6 g of toluene, and heated to 60° C. on a constant temperature heating plate for 9 minutes until the liquid crystal monomer was fully dissolved, and ultrasonic mixing was performed to obtain a precursor solution;

[0112] Step 2: Add 0.12g of crosslinking agent pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) (tetrathiol crosslinking monomer), 0.66g of spacer 2,2-(ethylenedioxy) diethyl mercaptan (EDDET) (dithiol monomer), 0.018g of photoinitiator Irgacure 651 (DMPA) and dissolve them into the solution. DMPA is a photoinitiator used to achieve the second stage photopolymerization reaction and 0.6g of catalyst dipropylamine (DPA) into the precursor solution of step 1, and then vigorously mix the solution on a vortex mixer for 3min; then continuously ultrasonically mix for 8min, and mix evenly to obtain a liquid crystal elastomer solution;

[0113] Step 3: inject the alloy liquid crystal elastomer solution in step 2 into a self-made polytetrafluoroethylene mold with a cylindrical groove structure, and then immerse the cylindrical polytetrafluoroethylene rod into the groove structure at a constant rate to avoid generating bubbles, and perform a thiol-acrylate click reaction at room temperature for 10 hours, and then demold to obtain an initial multi-domain liquid crystal polymer with a hollow radially symmetrical structure;

[0114] Step 4: placing the initial liquid crystal elastomer in an oven at 90° C. for 20 h to obtain a multi-domain liquid crystal elastomer;

[0115] Step 5: After the multi-domain liquid crystal elastomer is stretched to 220% of its original length by a uniform external force in the longitudinal direction, the light intensity is 70mW / cm 2 Photopolymerization was carried out under ultraviolet light for 25 min to obtain a single-domain liquid crystal elastomer;

[0116] Step 6: After cooling the single-domain high entropy alloy liquid crystal elastomer, a fast light-responsive liquid crystal elastomer actuator is obtained.

[0117] Performance Analysis:

[0118] 1. Morphology analysis of high entropy alloy nanoparticles

[0119] Figure 1As shown in Example 1, the scanning transmission electron microscope (STEM) of the high entropy alloy nanoparticles with the assistance of energy-dispersed X-ray spectroscopy (EDS) shows that the synthesized nanoparticles have a circular structure, and different composite elements are randomly dispersed in the nanoparticles, with neither obvious element separation nor phase separation.

[0120] 2. XPS spectrum analysis

[0121] Figure 2 The XPS analysis results of the high entropy alloy nanoparticles in Example 1 are shown. It can be analyzed that the elemental composition of the synthesized high entropy alloy nanoparticles is Fe, Ni, Ti, Cr and Mn elements.

[0122] 3. X-ray diffraction pattern analysis

[0123] Figure 3 The figure shows the XRD pattern of the entropy alloy nanoparticles of Example 3. Three peaks are observed at 43.14°, 49.70°, and 72.34°, corresponding to the (111), (200), and (220) planes, respectively. It can be analyzed that the crystal form of the high entropy alloy nanoparticles is a face-centered cubic structure.

[0124] 4. Wide-angle X-ray diffraction pattern analysis

[0125] Figure 4 2 is a front view photograph of the fast light-responsive liquid crystal elastomer actuator in Example 3 and a corresponding 2D-WAXD image, Figure 5 Shown is the azimuth diagram of the fast light-responsive liquid crystal elastomer actuator before and after stretching. Figure 4 and Figure 5 It shows that multi-domain high entropy alloy liquid crystal elastomer can be prepared into anisotropic single-domain high entropy alloy liquid crystal elastomer actuator by stretching and UV irradiation.

[0126] 5. Differential Scanning Calorimetry

[0127] Figure 6 Shown are differential scanning calorimetry (DSC) graphs of the single-domain liquid crystal elastomer actuator in comparative example 1 of the present invention and the fast light-responsive liquid crystal elastomer actuator in Example 3. It can be seen that the introduction of high-entropy alloy nanoparticles has almost no effect on the glass transition temperature (Tg) and nematic-isotropic phase transition temperature (TNI) of the liquid crystal elastomer actuator.

[0128] 6. X-ray diffraction pattern analysis

[0129] Figure 7Shown are the XRD patterns of the high entropy alloy nanoparticles in Example 3 of the invention, the fast light-responsive liquid crystal elastomer actuator in Example 3, and the single-domain liquid crystal elastomer in Comparative Example 1, indicating that the combination of the high entropy alloy nanoparticles and the liquid crystal elastomer does not destroy the respective structures of the high entropy alloy nanoparticles and the liquid crystal elastomer actuator.

[0130] 7. Solar absorption spectrum analysis

[0131] Figure 8 Shown are solar absorption spectrum curves of the high entropy alloy nanoparticles in Example 3 of the invention, the fast light-responsive liquid crystal elastomer actuator in Example 3, and the single-domain liquid crystal elastomer in Comparative Example 1. The gray area is the solar radiation spectrum, indicating that the addition of high entropy alloy nanoparticles greatly improves the solar light absorption of the liquid crystal elastomer, and the fast light-responsive liquid crystal elastomer actuator has a solar light absorption rate of up to 96%.

[0132] Infrared light photoresponse experiment:

[0133] 1. Infrared light response experimental plan

[0134] The photoresponse process of fast photoresponsive liquid crystal elastomer actuator materials was characterized using 808 nm infrared light.

[0135] 2. Experimental content

[0136] Experimental Grouping

[0137] Group 1: Liquid crystal elastomer actuator prepared in Comparative Example 1 (control group)

[0138] Group 2: Fast light-responsive liquid crystal elastomer actuator prepared in Example 3

[0139] 3. Experimental results

[0140] 3.1 Analysis of the photoresponse of fast photoresponsive liquid crystal elastomer actuators

[0141] like Fig. 9 As shown, when irradiated with 808-nanometer infrared light at an incident angle of 60 degrees, the liquid crystal elastomer actuator in the control group did not respond, while the fast light-response liquid crystal elastomer actuator could quickly respond to the light source and bend toward the direction of the light source.

[0142] 3.2 Photoresponse process of fast photoresponsive liquid crystal elastomer actuator

[0143] like Fig.10 As shown, the actuator is irradiated with 808-nanometer infrared light with an incident angle of 60 degrees, and the light response process of the actuator is observed. At 3 seconds, it is 14.4 degrees, at 5 seconds, it is 29.9 degrees, and at 14 seconds, the bending angle is consistent with the incident light angle of 60 degrees, indicating that the liquid crystal elastomer actuator in the present invention can achieve fast light response.

[0144] 3.3 Actuation of the actuator

[0145] like Fig.11 As shown, it is noteworthy that the fast photoresponsive liquid crystal elastomer actuator is highly reversible, with no obvious change in the actuation performance after more than 100 actuation cycles.

[0146] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fast light-responsive liquid crystal elastomer actuator, characterized in that: The liquid crystal elastomer actuator is a uniformly oriented single-domain high entropy alloy liquid crystal polymer, which is obtained by uniformly stretching a multi-domain high entropy alloy liquid crystal polymer in the longitudinal direction and then initiating photopolymerization by ultraviolet light; the multi-domain high entropy alloy liquid crystal polymer contains dispersed high entropy alloy nanoparticles, which are obtained by cross-linking liquid crystal monomers; The fast light-responsive liquid crystal elastomer actuator is a hollow radially symmetrical structure; The high entropy alloy is composed of Fe, Ni, Ti, Cr and Mn elements in equal molar ratios; The liquid crystal monomer is 1,4-bis-[4-(3-acryloxypropoxy)benzoyloxy]-2-methylbenzene.

2. The method for preparing a fast light-responsive liquid crystal elastomer actuator according to claim 1, characterized in that: The following steps are involved: Step 1: preparing high entropy alloy nanoparticles; Step 2: dissolving the liquid crystal monomer in an organic solvent, heating until the liquid crystal monomer is fully dissolved and then cooling to room temperature, adding the high entropy alloy nanoparticles prepared in step 1, and uniformly mixing to obtain a precursor solution; Step 3: adding a crosslinking agent, a spacer, a photoinitiator and a catalyst to the precursor solution of step 2, vortex stirring and uniformly mixing to obtain a high entropy alloy liquid crystal elastomer solution; Step 4: injecting the high entropy alloy liquid crystal elastomer solution in step 3 into the mold to carry out polymerization reaction, and demoulding after the reaction is completed to obtain an initial multi-domain high entropy alloy liquid crystal polymer; Step 5: volatilize and dry the organic solvent of the initial multi-domain high entropy alloy liquid crystal polymer in step 4 to obtain a multi-domain high entropy alloy liquid crystal polymer, i.e., a multi-domain high entropy alloy liquid crystal elastomer; Step 6: uniformly stretching the multi-domain high entropy alloy liquid crystal polymer obtained in step 5 in the longitudinal direction, and then performing ultraviolet-induced photopolymerization using a photoinitiator to form a single-domain high entropy alloy liquid crystal polymer with uniform orientation, i.e., a single-domain high entropy alloy liquid crystal elastomer; Step 7: Cool the single-domain high entropy alloy liquid crystal elastomer in step 6 to obtain a fast light-responsive liquid crystal elastomer actuator.

3. The method for preparing a fast light-responsive liquid crystal elastomer actuator according to claim 2, characterized in that: The method for preparing high entropy alloy nanoparticles in step 1 comprises the following steps: Step 1: Using Fe, Ni, Ti, Cr and Mn powders with a purity of ≥99.9% as raw materials and an average particle size of 45 μm; using a mechanical alloying method, using an omnidirectional planetary ball mill with anhydrous ethanol as an auxiliary, preparing high entropy alloy micro-sheets in an equal molar ratio, and pressing the micro-sheets into a cylindrical shape; Step 2: After adjusting the vacuum arc furnace to an oxygen-free atmosphere, the cylindrical high-entropy alloy in step 1 is added into the vacuum chamber of the arc furnace in sequence; when the vacuum degree is reduced, the reaction gas H2 and the inert gas Ar are introduced into the cavity, and the arc discharge process is maintained for 5min-30min for melting to ensure that the high-entropy alloy is made into nanoparticles; the cooling plate is set to 7℃-10℃ to obtain a non-equilibrium synthesis process, and the high-entropy alloy nanoparticles are collected after passivation for 6h-12h.

4. The method for preparing a fast light-responsive liquid crystal elastomer actuator according to claim 2, characterized in that: The organic solvent in step 2 is toluene, methyl chloride, methanol or acetone; The weight ratio of liquid crystal monomer to high entropy alloy nanoparticles in the precursor solution is 100:(1-5); The heating process is carried out on a constant temperature heating plate, the heating temperature is 40°C-130°C, and the heating time is 5min-10min.

5. The method for preparing a fast light-responsive liquid crystal elastomer actuator according to claim 2, characterized in that: In step 3, the crosslinking agent is pentaerythritol tetrakis-(3-mercaptopropionate), the spacer is 2,2-(ethylenedioxy)diethylmercaptan, the photoinitiator is Irgacure-651, and the catalyst is dipropylamine; The vortex stirring time is 1 min-5 min, and the uniform mixing is carried out by continuous ultrasonic mixing for 5 min-10 min to obtain a high entropy alloy liquid crystal elastomer solution.

6. The method for preparing a fast light-responsive liquid crystal elastomer actuator according to claim 2, characterized in that: The polymerization reaction is a thiol-acrylate click reaction carried out at room temperature with a reaction time of 6h-24h; In step 5, the organic solvent volatilization and drying process is to place the product in an oven at 50°C-120°C until the solvent is completely volatilized.

7. The method for preparing a fast light-responsive liquid crystal elastomer actuator according to claim 2, characterized in that: In step 6, the multi-domain high entropy alloy liquid crystal polymer is uniformly stretched in the longitudinal direction to 150%-300% of the original length, and the ultraviolet light intensity is 40mW / cm 2 -100mW / cm 2 The irradiation time is 5min-40min.

8. An application of the fast light-responsive liquid crystal elastomer actuator according to claim 1 in the field of intelligent soft robots.

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