Preparation method and application of liquid crystal membrane capable of dynamically programming and locking molecular switch

Abstract

The invention relates to the technical field of liquid crystal materials, and discloses a preparation method and application of a liquid crystal membrane capable of dynamically programming and locking a molecular switch, and the method comprises the following steps: blending a liquid crystal polymerizable monomer, a polymerizable monomer containing a dynamic covalent bond, a polymerizable molecular switch, dithiol, polythiol, a photoinitiator, a thermal initiator and toluene; and carrying out click reaction in a dark environment, and carrying out self-polymerization reaction under the irradiation of green light to obtain the liquid crystal film. According to the invention, a dynamic cross-linked polymer network formed by dynamic covalent bonds endows the molecular switch in the system with an adjustable molecular motion environment, and the motion environment is freely or limitedly switched according to the size of the free volume. Therefore, the molecular switch can endow the liquid crystal polymer with programmable stimulation response capability, and programming locking or unlocking can be realized by adjusting the free volume. The invention provides a new perspective for improving the controllability of the stimulation response behavior of the intelligent material, and has huge potential in the fields of anti-counterfeiting, information encryption and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal materials, and particularly relates to a preparation method and application of a liquid crystal film with a dynamically programmable locked molecular switch. Background Art

[0002] The mesogenic units in liquid crystal polymers change their stacking states in response to external stimuli (such as light, heat, and humidity), thereby changing the macroscopic properties of the materials. Light provides non-invasive characteristics and precise control, which endows photo-responsive liquid crystal polymers with unique advantages. The isomerizable molecular switches in liquid crystal polymers usually switch under different external field stimuli. For example, liquid crystal polymers containing molecular switch monomers such as spiropyrans, azobenzenes, or diarylethene can disrupt the arrangement of liquid crystal molecules through their isomerization or photothermal effects, and amplify the orientation changes at the molecular scale into macroscopic transformations of shape or color. This process is usually achieved by external field stimuli such as light of different wavelengths or different temperatures for switching.

[0003] In the same steady state, the isomer ratio of the molecular switch in the permanently cross-linked polymer network is fixed in the reversible isomerization cycle because the free volume in the polymer is fixed, and the isomerization of the polymerizable molecular switch at different steady states is also determined accordingly. When a given free volume is provided, the ratio of different isomers is fixed at the steady state under different stimulus responses.

[0004] However, once the liquid crystal polymer network is determined, the free volume of the molecular switch in the polymer is also restricted. The isomerization behavior at different steady states cannot be modified, which greatly limits the control of the isomerization behavior of the molecular switch in the liquid crystal polymer over the arrangement of liquid crystal molecules at different steady states to different degrees. Therefore, it is necessary to develop a simple and effective method to endow liquid crystal polymers containing polymerizable molecular switches with programmable stimulus responses at different steady states. Summary of the Invention

[0005] Based on this, the present invention provides a preparation method and application of a liquid crystal film with a dynamically programmable locked molecular switch, aiming to solve the problem of the single isomerization behavior of the existing liquid crystal film containing a molecular switch under different light steady states, and realizing the blank technical problem of gradually adjustable stimulus response behavior under the same steady state.

[0006] To achieve the above object, on the one hand, the present invention provides a preparation method of a liquid crystal film with a dynamically programmable locked molecular switch, which includes the following steps:

[0007] S1. Blend a liquid crystalline polymerizable monomer, a polymerizable monomer containing a dynamic covalent bond, a polymerizable molecular switch, a dithiol, a polythiol, a photoinitiator, a thermal initiator, and toluene uniformly to obtain a mixture;

[0008] S2. Pour the mixture into a mold and carry out a click reaction in a light-shielded environment to obtain an oligomer;

[0009] S3. Carry out a self-polymerization reaction on the oligomer under green light irradiation to obtain a liquid crystal film with a dynamically programmable locked molecular switch.

[0010] It should be noted that in the preparation method of the present invention, under the catalysis of an initiator, the polymerizable groups in the liquid crystalline polymerizable monomer, the polymerizable monomer containing a dynamic covalent bond, the monomer of the molecular switch, and the mercapto groups in dithiol and polythiol carry out Michael addition; after the liquid crystal prepolymer is formed by the click reaction, the green light is used to initiate the further self-polymerization reaction of the liquid crystal prepolymer, so that the crosslinking density of the liquid crystal prepolymer is further increased to form a self-supporting liquid crystal elastomer film.

[0011] The liquid crystal film prepared by the present invention: on the one hand, it can enable the molecular switch in the liquid crystal film to have precise control over controllable isomerization under the action of light, and the pattern obtained from the pigment color difference generated during the isomerization process is clear and visible to the naked eye, thereby endowing the liquid crystal film with the ability of information storage and visualization, and enhancing its application in information storage and multiple anti-counterfeiting; on the other hand, based on the response behavior of the network rearrangement of the dynamic covalent bonds in the liquid crystal film, the free volume around the photo-molecular switch can be controllably programmed to lock the isomerization behavior of the molecular switch, and different light steady states are given to the molecular switches with different programming states in the liquid crystal film under the irradiation of the same light source; on the third hand, the "programming-locking" process can be erased through the dynamic covalent bond exchange process, and the same free volume is re-given to the molecular switches in the liquid crystal film, so that their photo-isomerization behaviors are restored to be consistent, endowing the liquid crystal film with the functions of controllable programming and rewriting.

[0012] As a further preferred technical solution of the present invention, the liquid crystalline polymerizable monomer includes one or more of a first polymerizable monomer, a second polymerizable monomer, a third polymerizable monomer, and a fourth polymerizable monomer;

[0013] The first polymerizable monomer has a chemical structure shown in formula (I):

[0014]

[0015] In formula (I), R1 and R2 are independently selected from one of them; X is one of -CH3, -Cl, and -F; n is any integer from 1 to 18;

[0016] The second polymerizable monomer has a chemical structure shown in formula (II):

[0017]

[0018] In formula (II), R1 is one of; R2 is -CN, -F and -OC m H 2m+1 one of, m is any integer from 1 to 18; n is any integer from 1 to 18;

[0019] The third polymerizable monomer has a chemical structure shown in formula (III):

[0020]

[0021] In formula (III), R is one of; n is any integer from 1 to 18;

[0022] The fourth polymerizable monomer has a chemical structure shown in formula (IV):

[0023]

[0024] In formula (IV), R1 and R2 are independently selected from one of; m is any integer from 1 to 3; n is any integer from 1 to 18.

[0025] As a further preferred technical solution of the present invention, the molecular structure of the polymerizable monomer containing dynamic covalent bonds includes one of diselenide bonds, borate ester bonds, disulfide bonds, boroxine rings, imine bonds, and acylhydrazone bonds. Among them, diselenide bonds and disulfide bonds can undergo dynamic bond exchange under light or heat stimulation, borate ester bonds and boroxine ring bonds can undergo dynamic bond exchange under water or heat stimulation, and imine bonds and acylhydrazone bonds can undergo dynamic bond exchange under acidic environment or heat stimulation. The dynamic bond exchange reaction in the liquid crystal elastomer can realize the rearrangement of the internal polymer network, and the polymer network can be reprogrammed as needed.

[0026] The programming mechanism achieved by the present invention is as follows: In the initial state, the internal network of the liquid crystal film is unoriented, and the mesogenic units are randomly arranged. By stretching the film, the mesogenic units in the liquid crystal are oriented along the stretching direction. As the stretching progresses, the chain segments migrate and entangle, thus generating internal stress. The dynamic covalent bonds in the network will break under the stimulation of external fields such as light or heat, resulting in the formation of free radicals. The polymer chain segments with free radicals at the ends migrate within the network, untangle the chain entanglements and release the internal stress from the polymer network. Once the external stimulus is withdrawn, the shape of the liquid crystal film remains in the stretched state, effectively achieving shape programming. When thermal stimulation is applied to the programmed liquid crystal film, due to its shape memory property, it shrinks back to its initial state. The dynamic covalent bonds will also break under the influence of heat, enabling the molecular chain segments to move randomly, thereby destroying the ordered arrangement achieved through programming. After the heat treatment duration, the liquid crystal film maintains this thermally recovered state when removed from the thermal environment, effectively erasing the programmed state.

[0027] As a further preferred technical solution of the present invention, the polymerizable molecular switch is selected from one of azobenzene, spiropyran, and diarylethene molecular switches. The preparation method of the present invention realizes the re - restriction of the free volume in the polymer network by the rearrangement of the liquid crystal polymer network through dynamic covalent bonds, so as to realize the restriction of the isomerization behavior of the polymerizable molecular switch.

[0028] As a further preferred technical solution of the present invention, the dithiol is one or more of ethanedithiol, 1,4 - butanediol bis(mercaptoacetate), 2,2'-(ethylenedioxy)diethanethiol, and ethylene glycol bis(mercaptoacetate). The dithiol acts as a chain extender, and by reacting with the liquid crystal monomer, it increases the chain length of the polymer network, reduces the glass transition temperature of the polymer material, and increases the tensile properties of the polymer material.

[0029] As a further preferred technical solution of the present invention, the polythiol is pentaerythritol tetra - 3 - mercaptopropionate or trimethylolpropane tris(3 - mercaptopropionate). The polythiol acts as a cross - linker, and by increasing additional reaction sites, it changes the polymer network from a linear type to a three - dimensional network type.

[0030] As a further preferred technical solution of the present invention, in the mixture: the total molar amount of polymerizable groups in the liquid crystalline polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds, and the polymerizable molecular switch is in a ratio of (1 - 1.6):1 to the total molar amount of mercapto groups in the polymerizable monomer containing dynamic covalent bonds, dithiol, and polythiol. In practical applications, by controlling the addition ratio of each material, a uniform and stable liquid crystal film material can be generated.

[0031] As a further preferred technical solution of the present invention, the photoinitiator is one or more of 2 - hydroxy - 2 - methyl - 1 - phenylpropan - 1 - one, 1 - hydroxycyclohexyl phenyl ketone, 2 - methyl - 1-(4 - methylthiophenyl)-2 - morpholinopropan - 1 - one, benzoin dimethyl ether, 2,4,6 - trimethylbenzoyl - diphenylphosphine oxide, and bis(2,6 - difluoro - 3 - pyrrolophenyl)titanocene dichloride; and / or, the dosage of the photoinitiator is 0.1% - 3% of the total mass of the liquid crystalline polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds, and the polymerizable molecular switch. The photoinitiator induces the self - polymerization of the liquid crystalline polymerizable monomer. By controlling the dosage of the photoinitiator, the polymerization of the monomer molecular chains is initiated, thereby realizing the stable synthesis of the polymer.

[0032] As a further preferred technical solution of the present invention, the thermal initiator is one of lithium amide, metal hydride, basic amine, and alkoxide; and / or, the dosage of the thermal initiator is 1%-6% of the total mass of the liquid crystal polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds, and the polymerizable molecular switch. The thermal initiator plays a role in inducing the click reaction in the first stage. By controlling the addition amount of the thermal initiator, the activation energy of the reaction can be increased, and the reaction rate can be increased.

[0033] As a further preferred technical solution of the present invention, the dosage of toluene is 50%-300% of the total mass of the liquid crystal polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds, the polymerizable molecular switch, dithiol, polythiol, thermal initiator, and photoinitiator monomers.

[0034] According to another aspect of the present invention, the present invention also provides an application of a liquid crystal film with a dynamically programmable locked molecular switch in information storage materials or anti-counterfeiting materials.

[0035] Compared with the prior art, the advantages of the present application are as follows:

[0036] Through the dynamic covalent bond undergoing a dynamic bond exchange reaction under an external field stimulus, the controllable programming of the free volume of the molecular switch in the liquid crystal polymer network is realized. The control of the isomerization behavior of the molecular switch in the liquid crystal film is realized, that is, under the same steady state, by programming different parts of the liquid crystal film to different degrees, the molecular switch in the liquid crystal film has different degrees of isomerization under the same steady state. This process can be erased through dynamic covalent bond exchange, so that the free volume of the molecular switch in the liquid crystal film returns to the initial state, that is, it has the same degree of isomerization behavior. This preparation method provides a new perspective for improving the controllability of the stimulus response behavior of intelligent materials. The liquid crystal film obtained by this method has great potential in the fields of anti-counterfeiting and information encryption. Description of the Drawings

[0037] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0038] Figure 1 It is a diagram of the bond exchange mechanism in the liquid crystal film containing dynamic covalent bonds of the present invention;

[0039] Figure 2 It is a schematic diagram of the configuration transformation of the molecular switch of the present invention;

[0040] Figure 3 It is a diagram of the bond exchange mechanism in the liquid crystal film with a dynamically programmable locked molecular switch of the invention;

[0041] Figure 4Variation diagram of elongation of the liquid crystal film LCE1 of the dynamically programmable locking molecular switch in the stretched state in Embodiment 1 of the present invention after programming for different times under different light intensities;

[0042] Figure 5 Physical diagram of the liquid crystal film LCE1 of the liquid crystal film with a dynamically programmable locking molecular switch in different states in Embodiment 1 of the present invention;

[0043] Figure 6 Physical diagram of the liquid crystal film LCE1 of the liquid crystal film with a dynamically programmable locking molecular switch in Embodiment 1 of the present invention through photoengraved grayscale petal patterns.

[0044] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0045] The following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0046] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which the present invention pertains. The test reagents used in the following embodiments are all conventional biochemical reagents unless otherwise specified; the experimental methods are all conventional methods unless otherwise specified.

[0047] Embodiment 1

[0048] A preparation method of a liquid crystal film LCE1 with a dynamically programmable locking molecular switch provided in the embodiment of the present application includes the following steps:

[0049] S101: Blend liquid crystalline polymerizable monomers, polymerizable monomers containing dynamic covalent bonds, polymerizable molecular switches, chain extenders, crosslinking agents, photoinitiators, pre-diluted thermal initiators and toluene in the proportions shown in Table 1 to obtain a mixture;

[0050] S102: Pour the mixture into a polytetrafluoroethylene mold, keep it at room temperature in a ventilated place for 24 hours, and perform light-shielding treatment to obtain a liquid crystal prepolymer;

[0051] S103: Irradiate with a 520 nm light source of 30 mW / cm 2 for 15 minutes to obtain the liquid crystal film LCE1 with a dynamically programmable locking molecular switch.

[0052] Table 1 Sample formula for preparing LCE1

[0053]

[0054]

[0055] Example 2

[0056] A method for preparing a liquid crystal film LCE2 with a dynamically programmable locked molecular switch provided by an embodiment of the present application includes the following steps:

[0057] S201: Blend a liquid crystalline polymerizable monomer, a polymerizable monomer containing a dynamic covalent bond, a polymerizable molecular switch, a chain extender, a crosslinking agent, a photoinitiator, a pre-diluted thermal initiator, and toluene in the proportions shown in Table 1 to obtain a mixture;

[0058] S202: Pour the mixture into a polytetrafluoroethylene mold, keep it warm at 40 °C in a ventilated place for 24 hours, and perform light-shielding treatment to obtain a liquid crystal prepolymer;

[0059] S203: Irradiate with a 520 nm light source of 30 mW / cm 2 for 15 min to obtain the liquid crystal film LCE2 with a dynamically programmable locked molecular switch.

[0060] Table 2 Sample formula for preparing LCE2

[0061]

[0062]

[0063]

[0064] To illustrate the technical effects of the liquid crystal film with a dynamically programmable locked molecular switch prepared in the present application, corresponding schematic diagrams are used for illustration. As Figures 1 to 5 shown, where Figure 1 is a diagram of the bond exchange mechanism in the liquid crystal film containing dynamic covalent bonds; Figure 2 is a schematic diagram of the conformational transformation of the molecular switch; Figure 3 is a diagram of the bond exchange mechanism in the liquid crystal film with a dynamically programmable locked molecular switch.

[0065] According to Figure 1It can be seen that for the mechanism of liquid crystal polymer network rearrangement achieved through dynamic covalent bond exchange, in the initial state, the internal network of the liquid crystal film is unoriented, and the nematic mesogenic units are randomly arranged. By stretching the film, the mesogenic units in the liquid crystal are oriented along the stretching direction. As the stretching progresses, the chain segments migrate and entangle, thereby generating internal stress. The dynamic covalent bonds in the network will break under the stimulation of external fields such as light or heat, resulting in the formation of free radicals. The polymer chain segments with free radicals at the ends migrate within the network, untangle the chain entanglements, and release the internal stress from the polymer network. Once the external stimulation is withdrawn, the shape of the liquid crystal film remains in the stretched state, effectively achieving shape programming. When thermal stimulation is applied to the programmed liquid crystal film, due to its shape memory property, it shrinks back to its initial state. The dynamic covalent bonds also break under the influence of heat, enabling the molecular chain segments to move randomly, thereby disrupting the ordered arrangement achieved through programming. After the heat treatment duration, the liquid crystal film maintains this thermally restored state when removed from the thermal environment, effectively erasing the programmed state.

[0066] According to Figure 2 It can be seen that when the molecular switch is stimulated by different external fields, it can transform between different configurations, and performance changes such as pigment color and fluorescence color can occur between different molecular configurations.

[0067] According to Figure 3 It can be seen that the breakage and recombination of dynamic covalent bonds untangle the chain entanglements in the network, resulting in the transformation of the molecular chains from the initial loose arrangement to a more compact arrangement. After removing the tension and exposure, the dynamic covalent bonds reform, maintaining the molecular arrangement of the liquid crystal film in the stretched state, which leads to the overall elongation of the liquid crystal film in the stretching direction and property changes such as pigment color during the isomerization process. Due to the close packing of the chain segments, the free volume around the isomerized molecules decreases; therefore, when the molecular switch is restored to its initial configuration by applying an external stimulus, it tends to stay in the current state due to the reduction of its free volume. Therefore, the programmed film exhibits an intermediate state between the initial state and the isomerized programmed state. When the film is heated, the liquid crystal film restores its initial shape due to thermal recovery. The dynamic covalent bonds generate free radicals under thermal stimulation, allowing the chain segments to move randomly in the network. The arrangement of the chains returns to the initial loose and disordered state. Therefore, the configuration of the molecular switch can be restored to the initial state by applying an external stimulus. After the erasing process, the polymer network in the liquid crystal film and the free volume around the isomerization return to the initial state, and the response behavior of the liquid crystal film under steady state after different external field stimulations returns to consistency.

[0068] To verify the technical effects of this application, the patterned cholesteric liquid crystal film based on dynamic covalent bonds prepared in the examples was subjected to performance tests, and the results are Figures 4 to 6 as shown. Among them, Figure 4Graph of the elongation change of the liquid crystal film LCE1 of the dynamically programmable locking molecular switch in the stretched state after programming for different times under different light intensities; Figure 5 Physical diagram of the liquid crystal film LCE1 of the dynamically programmable locking molecular switch in different states; Figure 6 Physical diagram of the liquid crystal film LCE1 of the dynamically programmable locking molecular switch through photoengraved grayscale patterns.

[0069] According to Figure 4 It can be seen that after exposing the liquid crystal film LCE1 stretched to 200% to different exposure times using 450nm light sources of different intensities, the elongation of the programmed liquid crystal film LCE1 increases with the programming time and light intensity. At a programming time of 90min, the elongation rate of LCE1 increases from 12% under 100mW / cm 2 programming to 76% under 100mW / cm 2 irradiation. This process is due to the dynamic bond exchange of diselenide bonds, releasing the internal stress generated when the film is stretched, and the chain segment reorganization of the polymer network.

[0070] According to Figure 5 It can be seen that since different configurations of spiropyran molecules have different pigment colors, liquid crystal films containing different proportions of configurational spiropyran will have different pigment colors. LCE1 programmed for different times under a light intensity of 50mW / cm 2 will have a transition color from yellow to purple under a light steady state of 520nm.

[0071] According to Figure 6 It can be seen that stretching the liquid crystal film LCE1 of the dynamically programmable locking molecular switch prepared in this application to 200% of its original length, covering a four-leaf clover grayscale photomask on the film, applying 450nm light of 50mW / cm 2 for 90min, and then irradiating LCE1 with a 520nm light source of 50mW / cm 2 light intensity for 10min, a liquid crystal film with a four-leaf clover grayscale pattern can be obtained.

[0072] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The protection scope of the present invention is only defined by the appended claims.

Claims

1. A method for preparing a liquid crystal film capable of dynamically programming a locking molecular switch, characterized in that: The following steps are involved: S1. uniformly blending a liquid crystal polymerizable monomer, a polymerizable monomer containing a dynamic covalent bond, a polymerizable molecular switch, a dithiol, a polythiol, a photoinitiator, a thermal initiator and toluene to obtain a mixture; S2, pouring the mixture into a mold, allowing a click reaction to occur in a light-proof environment to obtain an oligomer; S3. The oligomer is subjected to self-polymerization reaction under green light irradiation to obtain a liquid crystal film that can dynamically program and lock the molecular switch.

2. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The liquid crystal polymerizable monomer includes one or more of a first polymerizable monomer, a second polymerizable monomer, a third polymerizable monomer, and a fourth polymerizable monomer; The first polymerizable monomer has a chemical structure shown in formula (I): In formula (I), R1 and R2 are independently selected from One of; X is one of -CH3, -Cl and -F; n is any integer from 1 to 18; The second polymerizable monomer has a chemical structure shown in formula (II): In formula (II), R1 is One of the following; R2 is -CN, -F and -OC m H 2m+1 One of the following, m is any integer from 1 to 18; n is any integer from 1 to 18; The third polymerizable monomer has a chemical structure shown in formula (III): In formula (III), R is One of; n is any integer from 1 to 18; The fourth polymerizable monomer has a chemical structure shown in formula (IV): In formula (IV), R1 and R2 are independently selected from One of the following; m is any integer from 1 to 3; n is any integer from 1 to 18.

3. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The molecular structure of the polymerizable monomer containing dynamic covalent bonds includes one of a diselenide bond, a borate bond, a disulfide bond, a borane bond, an imine bond, and an acylhydrazone bond.

4. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The polymerizable molecular switch is selected from azobenzene, spiropyran and diarylethene molecular switches.

5. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The dithiol is one or more of ethanedithiol, di(thioglycolic acid)-1,4-butylene glycol, 2,2'-(1,2-ethylenedioxy)diethanethiol, and ethylene glycol bisthioglycolate; And / or, the polythiol is pentaerythritol tetrakis-3-mercaptopropionate or trimethylolpropane tris(3-mercaptopropionate).

6. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: In the mixture, the ratio of the total molar amount of the polymerizable groups in the liquid crystal polymerizable monomer, the polymerizable monomer containing a dynamic covalent bond and the polymerizable molecular switch to the total molar amount of the thiol groups in the polymerizable monomer containing a dynamic covalent bond, dithiols and polythiols is (1-1.6):

1.

7. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The photoinitiator is one or more of 2-hydroxy-methylphenylpropane-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, benzoin dimethyl ether, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and bis-2,6-difluoro-3-pyrrolephenyl titanocene; And / or, the amount of the photoinitiator used is 0.1%-3% of the total mass of the liquid crystal polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds and the polymerizable molecular switch.

8. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The thermal initiator is one of lithium amide, metal hydride, alkaline amine and alkoxide; And / or, the amount of the thermal initiator is 1%-6% of the total mass of the liquid crystal polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds, and the polymerizable molecular switch.

9. The method for preparing a liquid crystal film capable of dynamically programmable locking molecular switches according to claim 1, characterized in that: The amount of toluene used is 50%-300% of the total weight of the liquid crystal polymerizable monomer, the polymerizable monomer containing dynamic covalent bonds, the polymerizable molecular switch, the dithiol, the polythiol, the thermal initiator and the photoinitiator.

10. Application of a liquid crystal film with dynamically programmable locking molecular switches prepared by the method of claim 1 in information storage materials and anti-counterfeiting materials.

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