291 results about "Liquid crystal elastomer" patented technology

The invention relates to the technical field of aerostats, solves the technical problem that a traditional CD-ROM device control design method is large in application range limitation, and particularly relates to a control method of a floating device and an autonomously-moving floating device.The control method comprises the steps that an independent air chamber is filled with low-density air, and the floating device autonomously floats in air; and establishing a control equation for controlling the autonomous movement of the floating device by controlling the illumination intensity, placing the floating device floating in the air in the illumination area, and autonomously controlling the floating device to advance according to the preset direction based on the control equation. The optical drive control system is simplified by utilizing the deformation characteristic of the liquid crystal elastomer, so that the light weight of the floating device is realized, fuel and a controller do not need to be carried, and long-time autonomous flight can be realized by utilizing photo-thermal energy so as to adapt to complex and changeable application scenes.

The invention relates to an electric heating type liquid crystal elastomer artificial muscle and a preparation method thereof, belongs to the technical field of intelligent high polymer materials, and solves the technical problems that the liquid crystal elastomer artificial muscle in the prior art is easy to harden and embrittle due to excessive filler and is weak in deformability. The electric heating type liquid crystal elastomer artificial muscle comprises two layers of liquid crystal elastomer films and an electric heating element, the electric heating element is arranged between the two layers of liquid crystal elastomer films; the raw materials of the liquid crystal elastomer film comprise a liquid crystal unit, a chain extender, a cross-linking agent and a catalyst. Wherein the liquid crystal unit is 1, 4-bis-[4-(3-acryloyloxy propoxy) benzoyloxy]-2-methyl benzene. Joule heat generated by the electric heating element can activate the liquid crystal elastomer, deformation of the liquid crystal elastomer is not limited, and therefore the liquid crystal elastomer has the advantages of being high in deformability, controllable in heating mode and time, programmable in driving and the like; and a self-sensing function is also realized, and the shape change can be monitored and regulated in real time according to the resistance.

A liquid crystal elastomer (LCE) formed from liquid crystalline monomers having 4-(6-(acryloyloxy)n-oxy)phenyl-4-(6-(acryloyloxy)m-oxy)benzoate (CnBAPE) as the mesogenic core. The LCEs have improved thermotropic characteristics, including lower thermotropic activation temperatures. The LCEs may also incorporate azobenzene to thereby also enhance the phototropic properties of the LCE.

The invention provides a rapid photoresponse liquid crystal elastomer actuator and a preparation method thereof, and belongs to a liquid crystal elastomer actuator in the technical field of high polymer materials. The liquid crystal elastomer actuator is a uniformly-oriented single-domain high-entropy alloy liquid crystal polymer, and is obtained by longitudinally and uniformly stretching a multi-domain high-entropy alloy liquid crystal polymer and then initiating photopolymerization by ultraviolet light; the multi-domain high-entropy alloy liquid crystal polymer contains dispersed high-entropy alloy and is obtained by cross-linking liquid crystal monomers; the fast photoresponse liquid crystal elastomer actuator is of a hollow radial symmetrical structure. The quick light response liquid crystal elastomer actuator has a full-solar spectrum absorption response function, has excellent plasticity and self-recovery performance, is simple and convenient in manufacturing process, integrates sensing, driving and built-in feedback loops, has high light tracking precision and self-adaptive phototropism, and can be used in the field of light tracking. And a brand new technical approach is provided for research and development of the intelligent soft robot.

The invention belongs to the technical field of soft robots, and discloses a lockable driver based on artificial muscles and a driving method of the lockable driver. The driver comprises an artificial muscle bundle, a locking device and a flexible connector, the artificial muscle bundle is formed by weaving a plurality of CD-ROM liquid crystal elastomer fibers in a chain shape, and 30%-50% of reversible contraction deformation can be generated under illumination; the locking device is of a layer blocking variable stiffness structure, and millisecond soft-hard state switching is achieved through vacuum negative pressure. During driving, light initiates phase change shrinkage of the liquid crystal elastomer, and then the locking device is vacuumized to fix deformation; and the flexible state can be recovered by charging positive pressure when the pressure is released. The problems that a traditional flexible driver is high in standby energy consumption and poor in load capacity are solved, the high deformation capacity and the lockable rigidity are achieved, and the flexible driver can be widely applied to the fields of exoskeletons, rehabilitation instruments and the like.

The invention discloses a high-strength and high-toughness liquid crystal elastomer and a preparation method and application thereof.The preparation method of the high-strength and high-toughness liquid crystal elastomer comprises the step that a sulfydryl-terminated liquid crystal oligomer, a rigid chain extender and a cross-linking agent react in the presence of a first catalyst and an optional first solvent, the high-strength and high-toughness liquid crystal elastomer is obtained. According to the high-strength and high-toughness liquid crystal elastomer disclosed by the invention, an effective solution is provided for realizing high strength and high toughness of the liquid crystal elastomer by introducing the rigid chain extender and a polyurethane structure hydrogen bond; the modulus and tensile strength of the liquid crystal elastomer are remarkably improved by a benzene ring rigid structure of the isocyanate-terminated chain extender; the multiplication of the hydrogen bond of the chain extender improves the strength of the material at room temperature on one hand, and on the other hand, the hydrogen bond is used as a sacrifice bond, an additional toughening mechanism is introduced again, and the liquid crystal elastomer has high strength and high toughness under the synergistic effect of multiple factors.

The invention provides an intelligent response liquid crystal elastomer and a preparation method thereof, and belongs to the field of liquid crystal elastomer preparation.The preparation method comprises the steps that a liquid crystal monomer, a cross-linking agent, a photoinitiator and a catalyst are dissolved in an organic solvent to obtain a mixed solution, then the mixed solution is injected into a template for primary cross-linking, and after fiber forming, the mixed solution is taken out and dried to obtain P-LCE fibers; the P-LCE fibers are subjected to drafting treatment and then soaked in a silica gel solution, then suspended and left to stand, and after the silica gel solution wrapping the surfaces of the fibers is dried and cured, secondary cross-linking is conducted to obtain the LCEP. The intelligent response liquid crystal elastomer prepared by the invention presents spiral curling shrinkage deformation under thermal stimulation, the shrinkage rate is large, the response rate is high, the deformation is reversible, and the shrinkage rate is almost unchanged after 100 times of cyclic stimulation.

The invention discloses a high-strength and high-toughness lignin-based liquid crystal elastomer as well as a preparation method and application thereof. A liquid crystal unit is subjected to hydroxyl end-capping modification and then reacts with a high-activity chain extender isocyanate to prepare a liquid crystal-polyurethane prepolymer, and finally the liquid crystal-polyurethane prepolymer is crosslinked with low-molecular-weight lignin, so that the lignin-based liquid crystal elastomer is prepared through a one-pot two-step method. According to the invention, a preparation system of a conventional liquid crystal elastomer by utilizing Michael addition polymerization is changed, a natural microphase separation structure and a strong intermolecular interaction force of polyurethane are utilized, and meanwhile, lignin with good compatibility with a liquid crystal unit is introduced as a covalent cross-linking agent, so that the mechanical properties of the liquid crystal elastomer are greatly improved. The prepared lignin-based liquid crystal elastomer is high in strength and toughness, can be repeatedly processed and utilized, has an ultraviolet aging resistance function and a shape memory function, and overcomes the problem that a traditional liquid crystal elastomer is poor in mechanical property.

The invention belongs to the field of intelligent materials, and discloses a nematic phase liquid crystal elastomer fiber and a method for optimizing the thermal shrinkage performance of the nematic phase liquid crystal elastomer fiber. According to the method, the mass ratio of a cross-linking agent pentaerythritol tetra (3-mercaptopropionate) (PETMP) to a chain extender 2, 2 '-[1, 2-ethanediyl bis (oxygen)] bis (ethanethiol) (EDDET) in an LCE spinning solution is accurately controlled through a wet spinning technology, and drafting and heat treatment processes are combined, so that the LCE fiber with adjustable and controllable heat shrinkage performance and mechanical performance is prepared. The invention aims to overcome the limitations of low response speed, low shrinkage rate, insufficient environmental stability and the like of the existing LCE fiber. The reversible thermal shrinkage rate of the fiber can reach up to 35%, the maximum shrinkage deformation can be completed within 2 seconds at the soonest at the temperature of 80 DEG C, and the maximum tensile strength can reach 170 MPa. And the catalyst has excellent oxidation stability (the mass retention rate is about 97%), and can maintain efficient thermal response in a water environment. And a new way is provided for development of high-performance intelligent materials.

The invention provides a preparation method of high-response-characteristic high-thermal-conductivity particle / liquid crystal elastomer bionic muscle fibers, and belongs to the technical field of functional materials. According to the method, the surface of the liquid crystal elastomer preform is coated with the high-thermal-conductivity particles, the heat conduction capability of the high-thermal-conductivity particles is utilized, so that the heated part of the liquid crystal elastomer preform can be uniformly stretched when the liquid crystal elastomer preform is drawn by adopting a hot drawing forming method, and the liquid crystal elastomer preform is partially or completely immersed in the suspension during soaking, so that the liquid crystal elastomer preform is completely immersed in the suspension; and the bionic muscle fiber subjected to hot drawing molding shows a differential hot bending characteristic. The method can realize continuous processing and is suitable for large-scale production. The prepared bionic muscle fiber keeps the characteristic of high indirect thermal stimulation response, and has important application value in the fields of medical devices, motion assistance, bionic materials and the like in the aspects of controlling elbow parts with loads, clamping devices and the like as a flexible driver.

The invention relates to a pressure and temperature multifunctional sensor for energy collection and a manufacturing method thereof, the pressure and temperature multifunctional sensor adopts a double-layer composite structure: an upper wire coil layer is composed of a liquid metal coil embedded in a PDMS substrate, silver paint and a wire connected with the silver paint, and a lower magnetic fiber network layer is formed by weaving magnetic liquid crystal elastomer LCE composite fibers; the two are structurally integrated through a bonding layer; a coil conductive loop in the upper wire coil layer is formed on the surface of the PDMS substrate through a direct-writing printing technology, and packaging protection is completed through secondary pouring of PDMS; the LCE composite fiber takes an LCE hollow fiber tube as an external carrier, magnetorheological fluid is filled in the LCE composite fiber to serve as a magnetic medium, and two ends of the LCE composite fiber are sealed and packaged by adopting a compound of neodymium iron boron magnetic particles and PDMS (Polydimethylsiloxane). The sensor provided by the invention not only can realize pressure and temperature sensing, but also can be used as an energy collection device, provides a new solution for sustainable development of wearable equipment and sensors, and has a wide application prospect.

A sound absorbing device includes an acoustic resonator with an opening and at least one fabric layer extending across the opening. The at least one fabric layer includes reversible actuatable liquid crystal elastomer (LCE) fibers such that an average pore size of the at least one fabric layer increases with decreasing temperature and decreases with increasing temperature. The sound absorbing device also includes at least one of a heater configured to heat the at least one fabric layer such that the average pore size of the at least one fabric decreases and a cooler configured to cool the at least one fabric layer such that the average pore size of the at least one fabric increases. And in some variations a controller configured to command the heater to heat to the at least one fabric layer and command the cooler to cool the at least one fabric layer is included.

Provided are articles including a substrate and a curable composition comprising 50 to 81 weight percent of a liquid crystal monomer, 1 to 24 weight percent of a chain extender, 6 to 26 weight percent of a crosslinker, and 0 to 1.5 weight percent of an initiator, wherein the curable composition is adjacent to the substrate, and wherein the curable composition is in the form of a continuous or discontinuous layer. Also provided are articles including a substrate and a cured composition of a curable composition comprising 50 to 81 weight percent of a liquid crystal monomer, 1 to 24 weight percent of a chain extender, 6 to 26 weight percent of a crosslinker, and 0 to 1.5 weight percent of an initiator, wherein the curable composition is adjacent to the substrate, wherein the curable composition is in the form of a continuous or discontinuous layer, and wherein the cured composition comprises a liquid crystal elastomer comprising a monodomain.

The invention discloses an intelligent purification coating with a bionic pulmonary membrane type respiratory metabolism function. The intelligent purification coating comprises a sensing and adsorption layer, a driving and transportation layer and a catalysis and metabolism unit, the sensing and adsorption layer is composed of a chemical heterojunction network formed by two-dimensional transition metal carbonitride MXene and a zeolite imidazate framework structure material through an in-situ coordination reaction of metal ions and hydroxyl groups on the surface of MXene; the driving and transporting layer takes a cross-linked liquid crystal elastomer network as an intelligent response matrix, and high-length-diameter-ratio magnetic ferroferric oxide nanorods of which the surfaces are modified by a silane coupling agent are uniformly dispersed and embedded into the matrix; and the catalysis and metabolism layer is anchored on a preset key mass transfer path in the driving and transporting layer in a discrete metabolism island form. According to the coating, various volatile organic compounds (VOCs) and enzyme-light synergistic deep mineralization can be realized under mild conditions, and the energy metabolism function of mitochondria can be accurately simulated.

The invention relates to the technical field of multi-degree-of-freedom motion platforms, in particular to a multi-mode self-oscillation three-line pendulum platform based on CD-ROM liquid crystal elastomer fibers, which comprises a bottom plate, a bracket is mounted at the top of the bottom plate, a motion platform assembly is mounted on the bracket, and an infrared laser is mounted on the bottom plate; the motion platform assembly comprises an upper suspension disc, a lower suspension disc and LCE fibers, the upper suspension disc is fixedly connected with the support, the upper suspension disc and the lower suspension disc are connected through the LCE fibers, the upper suspension disc and the lower suspension disc are identical circular flat plates, the two ends of the three LCE fibers are installed on the side lines of the upper suspension disc and the lower suspension disc respectively, the lengths of the three LCE fibers are identical, and the length of the LCE fibers is equal to that of the LCE fibers. And the three LCE fibers are parallel to one another. The technical problems that an existing multi-degree-of-freedom motion platform depends on a complex mechanical structure or electromagnetic control, the size is large, energy consumption is high, driving can only be achieved through contact and the like are solved, and the existing multi-degree-of-freedom motion platform is difficult to be suitable for the fields of miniaturization, electromagnetic interference resistance and non-contact driving.

The invention provides an SEBS (Styrene-Ethylene-Butylene-Styrene)-based liquid crystal elastomer and a preparation method thereof, and belongs to the field of synthesis and application of thermally-induced reversible deformation liquid crystal polymers. The liquid crystal elastomer is a low-degree cross-linked polymer network prepared from an ethylene-ethylene / butylene-styrene block copolymer SEBS and a double-end sulfydryl main chain type liquid crystal oligomer through photo-cross-linking curing, and a two-step secondary cross-linking mode is adopted. The material is prepared through a two-step method of PS segment physical structural domain pre-crosslinking and thiol-ene click reaction photo-crosslinking, and has bidirectional reversible deformation capability. By controlling the content of the liquid crystal units and the crosslinking and curing degree, the phase transition temperature and reversible deformation capability of the polymer material are regulated and controlled; a new thought and a new method are provided for preparing an intelligent flexible driver material with a novel function; on the basis of the liquid crystal polymer network, the SBS and SEBS materials can be developed towards high performance and intelligence.

The invention discloses a flexible actuator integrating driving, sensing and rigidity changing and a manufacturing and driving method of the flexible actuator. The actuator adopts a three-layer composite structure: a driving layer is composed of a liquid crystal elastomer and can generate reversible deformation in response to light or thermal stimulation; the variable stiffness layer is composed of a polydopamine modified stiffness adjustable polymer, and active switching of stiffness and deformation locking can be achieved through thermal regulation and control; the sensing layer is composed of a multi-walled carbon nanotube grid, can be integrally formed with the driving layer, and monitors self deformation in real time by transmitting resistance signals; the actuator is obtained by compounding the three layers; the driving method comprises repeated heating and cooling so that the actuator can be bent, fixed and restored. Through cooperation of the three functional layers, unification of optical / thermal multi-mode driving, real-time self-sensing and active deformation locking is achieved, an actuator can lock any middle deformation state by regulating and controlling the cooling rate, and the optical / thermal multi-mode driving device has the advantages of being diverse in driving mode, high in deformation controllability and low in energy consumption.

The invention relates to the technical field of intelligent materials and structural dynamics, solves the technical problems that an existing tumbler structure is lack of self-continuous motion ability and depends on external energy, and particularly relates to a light-driven liquid crystal elastomer tumbler and a nonlinear dynamics control method thereof. Self-continuous swinging under illumination of certain intensity is realized by utilizing light response design of the liquid crystal elastomer and coupling of nonlinear restoring force, and application is performed by utilizing regular movement of the liquid crystal elastomer. The tumbler structure can generate a state alternating process from swinging out of an illumination area to swinging back to the illumination area under the condition of specific light source intensity, and the change amplitude of standing and inclining alternation can be changed by adjusting illumination parameters. According to the tumbler structure, the limitation problem of a traditional tumbler can be solved, the tumbler structure can achieve self-continuous movement under the condition that the tumbler structure does not depend on external periodic stimulation, and the application of the tumbler structure is expanded.

The invention belongs to the technical field of all-solid-state batteries, and particularly relates to a liquid crystal elastomer-containing sulfide solid-state battery and a preparation method thereof. The sulfide solid-state battery comprises an electrode membrane and an electrolyte membrane, and the electrode membrane is prepared by mixing a liquid crystal elastomer serving as a binder with an electrode material through a dry method; and / or the electrolyte membrane is prepared by mixing a liquid crystal elastomer serving as a binder with a sulfide solid electrolyte through a dry method; the liquid crystal elastomers are the same or different and are prepared from liquid crystal functional monomers containing at least one unsaturated bond and polymeric monomers containing unsaturated double bonds through free radical polymerization; or the liquid crystal functional monomer containing at least one unsaturated bond and a polymeric monomer containing sulfydryl or amido are subjected to sulfur-alkene reaction or Michael addition reaction. In the preparation process of the sulfide solid-state battery, a solvent is not needed, and the sulfide solid-state battery has important significance of energy conservation, emission reduction and environmental protection.

The invention discloses a preparation method of a mechanochromic photonic crystal composite film as well as a product and application of the mechanochromic photonic crystal composite film. The TPU / CLCE composite film is prepared by compounding a mechanically force-induced color-changing cholesteric liquid crystal elastomer (CLCE) film onto a black polyurethane (TPU) film purchased on the market through a water transfer printing technology. The composite film prepared by a water transfer printing method has good tensile property, the shape and the color can be completely recovered, and the composite film has strong metal reflection color. The composite film meets the basic performance requirements of the color-changing car cover, can be further expanded to be applied to the fields of intelligent wearable equipment, consumer electronics and the like, and provides unique visual effects and functional characteristics for products. Good market application prospects are realized.

The invention discloses a preparation method of a flexible heat regulator material based on liquid crystal elastomer-liquid metal composite foam. The preparation method comprises the following three steps: preparation of pre-crosslinked liquid crystal elastomer foam, deformation programming of the liquid crystal elastomer foam and compounding of the liquid crystal elastomer foam and liquid metal. The obtained liquid crystal elastomer-liquid metal composite foam has a thermally induced reversible deformation characteristic, is in a contraction state in a low-temperature region and in an expansion state in a high-temperature region, has a transition temperature window of 40-100 DEG C, has a maximum thermal resistance switch ratio of 3.8, has flexibility below a nematic-isotropic transition temperature (TNI), and has high elasticity above the TNI. The thermal regulator material disclosed by the invention realizes consideration of high switch ratio and mechanical flexibility, and can provide important material support for dynamic and intelligent thermal management of a flexible system in the future.

The invention discloses a large-driving-force liquid crystal elastomer composite artificial muscle belt and a manufacturing method and application thereof. The preparation method comprises the following steps: reacting a mixed reaction system containing a liquid crystal monomer, a chain extender, a cross-linking agent, a photoinitiator, a catalyst and a nano material to prepare a composite oligomer; and placing the composite oligomer in a mold, removing the solvent, and then carrying out stretching and cross-linking treatment to obtain the liquid crystal elastomer composite artificial muscle band with large driving force. The composite artificial muscle belt can achieve linear contraction under thermal stimulation, and large thrust can be generated in the recovery process; meanwhile, the composite artificial muscle belt can achieve large driving force output without being assembled by an artificial muscle fiber bundle, and the technical problem caused by the fact that a plurality of artificial muscle fiber bundles are assembled to achieve contraction force amplification is solved.

A terahertz-band metasurface circular dichroic device based on liquid crystal elastomers, and a preparation method therefor. The metasurface circular dichroic device comprises a dielectric layer (1), a plurality of movable structural main bodies (2) and a plurality of liquid crystal elastomers (3), wherein the movable structural main bodies (2) are periodically attached onto the dielectric layer (1); the liquid crystal elastomers (3) are attached to a part of each movable structural main body (2); and the response of the metasurface circular dichroic device can be adjusted by means of structural changes in the movable structural main bodies (2). Circular dichroism values are flexible and adjustable at different frequencies by means of the different bending degrees of microstructural metal sheets (22) inside the movable structural main bodies (2). By means of the attachment of the liquid crystal elastomers (3), the response performance and the flexibility of the metasurface circular dichroic device are further improved, thereby further improving the usage flexibility of detection while simplifying the structure of the circular dichroic device, and facilitating the detection on chiral molecules.

The invention provides a fiber artificial muscle for realizing large strain by utilizing thermally induced self-helix and a preparation method thereof. The preparation method comprises the following steps: dissolving a liquid crystal monomer, a chain extender, a cross-linking agent and a photoinitiator in an organic solvent, and carrying out Michael addition reaction for 20-30 minutes to form an oligomer; preparing liquid crystal elastomer fibers by using a direct writing and printing method, and placing the obtained fibers at room temperature for 24 hours for later use; the fiber and a carbon nano tube fiber are stranded and twisted for a certain twist degree to form a winding fiber. After being electrified, the fiber artificial muscle can be heated to the highest temperature within a short time (4s), and the self-spiral behavior of the fiber can be rapidly completed after the fiber is heated. The output work density of the fiber reaches 55.74 J / kg. The preparation method is simple, efficient and low in cost, and has large output strain (60%) and electrothermal driving performance.

Described herein are various embodiments for liquid crystal elastomers (LCE) formed from liquid crystalline monomers having 4-(6-(acryloyloxy) n-oxy) phenyl-4-(6-(acryloyloxy)m-oxy)benzoate (CnBAPE) as the mesogenic core. The LCEs described herein have improved thermotropic characteristics, including lower thermotropic activation temperatures. The LCEs described herein may also incorporate azobenzene to thereby also enhance the phototropic properties of the LCE.

The invention relates to the technical field of flexible sensors, and particularly discloses breathable ion skin which comprises water, a polymer, a liquid crystal and a conductive ion active substance. The material with unique soft elasticity is prepared by combining the orderly-oriented liquid crystal material and the polymer elastomer, the excellent adhesion stability can be kept under the cyclic load, and the stripping interface toughness is high. The composite fiber membrane of a liquid crystal elastomer core-ion skin shell structure is prepared through coaxial electrostatic spinning, the liquid crystal elastomer core provides good structural stability and adhesion stability, the ion skin shell provides good signal detection capacity, and meanwhile, the porous membrane structure prepared through electrostatic spinning has the ultrahigh water vapor permeability and can be used for preparing the composite fiber membrane of the liquid crystal elastomer core-ion skin shell structure. Sweat generated at the contact site of the ion skin and the human skin can be quickly volatilized, sweat accumulation is reduced, and the human skin does not have inflammatory response after the ion skin is worn for a long time.

The invention discloses a liquid crystal elastomer structure multi-objective optimization method based on depth evolution mapping. According to the method, by constructing a mapping model from individual features to operator parameters, an optimization algorithm can adaptively adjust the intensity of crossover and mutation operations according to the position, fitness ranking and neighborhood features of each candidate solution in a search space, so that the local refining effect is enhanced while the global exploration capability is kept. Compared with an existing parameter adjusting method based on a unified parameter strategy or population statistics, the method has the advantage that self-adaptive optimization of an individual level is realized. The method belongs to the cross technical field of computational material science, intelligent optimization algorithms and structural design, can be applied to the performance optimization problem of intelligent material systems such as soft robot drivers, artificial muscles and flexible sensors, and can also be popularized to other engineering design scenes involving high-dimensional parameter space and multi-target tradeoff.

According to the double-layer near-infrared light response liquid crystal elastomer and the preparation method thereof, the liquid crystal elastomer is prepared from a liquid crystal monomer, a dynamic acetal monomer, a cross-linking agent and a chain extender through a Michael addition reaction by a one-pot method, and the material is endowed with light response performance by adding a photo-thermal dye. The double-layer near-infrared light response liquid crystal elastomer is obtained by combining a liquid crystal elastomer film containing photo-thermal dye and a liquid crystal elastomer film not containing photo-thermal dye through dynamic exchange action of hot-pressing trigger dynamic covalent bonds and then mechanically stretching and orienting. According to the invention, the preparation is simple, the raw materials are easy to obtain, the reprogramming and self-repairing functions of the LCE-SCA material are realized through the dynamic exchange effect of the dynamic acetal bond under external stimulation, and a basis is provided for preparing a double-layer liquid crystal elastomer material; the multi-stimulus response is realized by adding photo-thermal dye and the like; and the formed dynamic cross-linked network can generate network structure recombination when being heated to a dynamic exchange temperature, so that the cross-linked liquid crystal elastomer can be reprocessed and recycled.

Stretchable and flexible thermoelectric devices may generally include a substrate having an array of semiconductors in electrical communication via a plurality of liquid metal interconnects, and coated on at least a portion thereof with opposing liquid crystal elastomer layers. The liquid crystal elastomer layers may be reaction products of a reaction mixture of a mesogenic group, a spacer, a crosslinker, and a photoinitiator. The liquid crystal elastomer layers may alternately heat and cool to achieve cyclical bending actuation when voltage is applied to the thermoelectric device. Methods of making and using the thermoelectric devices are also described.

The application provides a preparation method of a liquid crystal elastomer foam doped with boron nitride, comprising the following steps: 1) preparation of a NaCl salt template; 2) preparation of a liquid crystal elastomer monomer solution: a liquid crystal elastomer monomer solution is prepared by adding a sufficient amount of a toluene solution into 1,4-bis-[4-(3-acryloyloxypropoxy)benzoyloxy]-2-methyl benzene RM257 as a liquid crystal unit; 3) formation of a liquid crystal elastomer network; 4) preparation of a pre-crosslinked liquid crystal elastomer foam; 5) deformation programming of the liquid crystal elastomer foam: the pre-crosslinked liquid crystal elastomer foam is placed into the template for constant compression, and secondary crosslinking is performed using ultraviolet light under the constant compression state to form a secondary crosslinking network; at this time, the liquid crystal elastomer foam has a thermoreversible deformation characteristic, which is manifested as expansion at a temperature rise and shrinkage at a temperature drop, and the process cycle is reversible; and 6) preparation of a liquid crystal elastomer / heat-conducting BN composite foam.