CN113698518A - Liquid crystal elastomer material based on liquid metal nano droplets - Google Patents

Liquid crystal elastomer material based on liquid metal nano droplets Download PDF

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CN113698518A
CN113698518A CN202110972638.1A CN202110972638A CN113698518A CN 113698518 A CN113698518 A CN 113698518A CN 202110972638 A CN202110972638 A CN 202110972638A CN 113698518 A CN113698518 A CN 113698518A
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杨洪
陆海峰
王猛
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Southeast University
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Abstract

The invention discloses a liquid crystal elastomer material based on liquid metal nano liquid drops and a preparation method and application thereof. Liquid metal nano droplets are introduced into a liquid crystal elastomer matrix material, the sulfur element in a molecular chain and liquid metal have dynamic interaction, so that the liquid metal nano droplets can be uniformly distributed in the liquid crystal elastomer, and the liquid crystal elastomer material (LM-LCE) based on the liquid metal nano droplets is finally prepared by thermally initiating secondary crosslinking. The mechanical property, especially the fatigue resistance, of the composite liquid crystal elastomer material is greatly improved, and the soft actuator material based on the liquid crystal elastomer and long-term industrial application beyond the soft actuator material can be effectively promoted.

Description

Liquid crystal elastomer material based on liquid metal nano droplets
Technical Field
The invention relates to the field of liquid crystal elastomers, in particular to a liquid crystal elastomer material with ultrahigh fatigue resistance, which is formed by compounding liquid metal nano microdroplets and a liquid crystal elastomer base material.
Background
Liquid Crystal Elastomers (LCEs), which are unconventional types of polymeric materials that combine the anisotropy of mesogens with the entropic elasticity of elastomers, are reversibly deformable in response to external stimuli such as heat, light, humidity, electricity and magnetic fields. The excellent two-way shape memory function makes LCE material possess latent application foreground in soft executor, sensor, micro mechanical system, soft robot technology, etc. However, the unsatisfactory mechanical properties of conventional LCE materials, especially moderate driving stress and poor fatigue resistance, have become fundamental obstacles that hinder the practical industrial application of LCE materials. It is highly desirable to develop new LCE materials that have both large drive stroke, high drive stress and excellent fatigue resistance, but this remains a formidable challenge.
In order to improve the mechanical properties of LCE materials, most previous research work has focused on introducing new molecular structures, crystallization treatments, interpenetrating networks and adding nanofillers to enhance driving stress, elastic modulus and working capacity; however, the fatigue resistance of LCE materials is selectively neglected. Fatigue resistance of LCE materials is a critical factor for their industrial applications, and the long-term durability of LCEs has been hardly studied in the last 40 years. In fact, this drawback derives from the inherent drawbacks of LCE structural networks: to achieve high driving strain, LCE materials are always lightly crosslinked. This low crosslink density means that some polymer chains may not be chemically crosslinked, and therefore during actuation, the uncrosslinked polymer chains will suffer irreversible slippage, the physical association of the relevant polymer chains will be compromised, some parts of the molecular network will be compromised, the polymer internal structure will be permanently damaged, leading to poor fatigue resistance.
In order to improve the fatigue resistance of LCE materials, the traditional approach of research has been to incorporate a number of reinforcing materials such as gold nanoparticles, carbon nanotubes and carbon fibers into the LCE matrix to introduce additional physical associations to reinforce the chain-like network of LCEs, but without achieving the desired effect, which may be due to phase separation that occurs without interaction between the reinforcing materials and the LCE matrix.
The document proc.natl.acad.sci.u.s.a.2019,116,21438 reports a method of introducing a liquid metal into a liquid crystalline elastomer, producing a liquid crystalline elastomer material that can be electrically driven. It uses a liquid crystal monomer of 1, 4-bis- [4- (3-acryloyloxypropoxy) benzoyloxy ] -2-methylbenzene. The liquid metal is introduced too much, the size of liquid metal droplets is too large, about hundreds of microns, the clearing point of the liquid crystal elastomer is high and exceeds 60 ℃, the mechanical property of the liquid crystal elastomer is not very large, and the literature does not study and report the fatigue resistance of the liquid crystal elastomer.
The document Soft Matter,2020,16,5878 also reports a method for introducing liquid metal into a liquid crystal elastomer, thereby preparing a conductive composite liquid crystal elastomer material. It uses a liquid crystal monomer of 1, 4-bis- [4- (3-acryloyloxypropoxy) benzoyloxy ] -2-methylbenzene. The liquid metal is dispersed in the liquid crystal elastomer in a micron size, so that the conductivity of the composite liquid crystal elastomer is realized, but the mechanical property of the novel composite liquid crystal elastomer is not well improved, and the fatigue resistance is not researched and reported. At present, composite materials of liquid crystal elastomers and liquid metals exist, but the liquid metals of the composite materials are all micron-sized or more in order to realize the conductivity of the composite materials, and the mechanical properties of the composite materials of the liquid crystal elastomers are not greatly improved.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a liquid crystal elastomer material based on liquid metal nano liquid drops, which has ultrahigh fatigue resistance, solves the problem of short service life of the traditional liquid crystal elastomer material in the practical application process, and provides a preparation method of the material.
The technical scheme is as follows: the liquid crystal elastomer material based on the liquid metal nano liquid drops is formed by polymerizing liquid crystal monomers, after polymerization, the liquid crystal monomers are orderly arranged in a molecular chain in a liquid crystal element mode along a stretching direction to form a molecular main chain, and liquid metal is crushed into nano-level micro-droplets which then have dynamic interaction with sulfur elements in the molecular main chain to be uniformly and stably dispersed in a liquid crystal elastomer matrix.
The liquid crystal monomer is 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate.
The liquid metal is gallium indium tin alloy, and the mass ratio of gallium, indium and tin is 0.62-0.8: 0.25-0.1: 0-0.13.
The mass ratio of the liquid metal to the liquid crystal monomer is 5-8%.
The preparation method of the liquid crystal elastomer material based on the liquid metal nano liquid drops comprises the following steps:
step 1, carrying out water removal treatment on a liquid crystal monomer 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate, a chain extender 2, 2-oxybis (ethane-1-thiol), a cross-linking agent pentaerythritol tetra (3-mercaptopropionate) and liquid metal;
step 2, putting all the materials in the step 1 into anhydrous dichloromethane, and then putting the materials into a brown strain bottle to be fully stirred under the condition of introducing nitrogen to form a uniform solution;
step 3, dissolving a catalyst dipropylamine in dichloromethane, and then adding the solution into the brown strain bottle;
step 4, carrying out ultrasonic treatment for 1-1.5h by using an ultrasonic crusher to crush the liquid metal into nano-grade metal, and realizing uniform mixing of the mixture;
step 5, pouring the mixture into a polytetrafluoroethylene groove, and then putting the polytetrafluoroethylene groove into a 36-45 ℃ oven for heat preservation for 1-1.5 h;
step 6, cooling the polytetrafluoroethylene groove in the step 5 to room temperature to prepare an unoriented liquid crystal elastomer material LM-LCE film based on liquid metal nano liquid drops;
step 7, cutting the unoriented LM-LCE film into a long strip, stretching at room temperature and keeping the long strip fixed to obtain a stretched and oriented LM-LCE film made of liquid crystal elastomer materials based on liquid metal nano liquid drops;
and 8, putting the stretched and oriented long-strip LM-LCE film prepared in the step 7 into an oven, keeping the temperature of the oven at 36-45 ℃ for 8-11h, and naturally cooling the film to room temperature to prepare the liquid crystal elastomer material LM-LCE film based on the liquid metal nano liquid drops and having an oriented structure.
Wherein the content of the first and second substances,
the liquid crystal monomer 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate has the following structural formula:
Figure BDA0003226441570000031
the cross-linking agent pentaerythritol tetra (3-mercaptopropionate) has the following structural formula:
Figure BDA0003226441570000032
the chain extender 2, 2-oxybis (ethane-1-mercaptan) has the following structural formula:
Figure BDA0003226441570000033
the catalyst dipropylamine has the following structural formula:
Figure BDA0003226441570000041
the mass ratio of the liquid crystal monomer, the chain extender and the cross-linking agent in the step 1 is as follows: liquid crystal monomer Y2003: chain extender DMDE: the cross-linking agent PETMP is 1:20: 22-1: 10: 12;
the mass ratio of the liquid metal to the liquid crystal monomer chain extender to the cross-linking agent is as follows: liquid metal: (liquid crystal monomer + chain extender + crosslinking agent) ═ 1:20 to 1: 12.
The chain extender 2, 2-oxybis (ethane-1-thiol) in step 1 is replaced by 3, 6-dithio-1, 8-octanediol.
The power of the ultrasonication apparatus in step 4 was set to 360W.
And in the step 7, the unoriented LM-LCE film is cut into long strips, stretched at room temperature to 2-2.7 times of the original length and kept fixed.
The liquid crystal elastomer based on the liquid metal nano droplets has super fatigue resistance, solves the problems of low durability and short service life of the conventional liquid crystal elastomer in the practical application process, and has great potential application in the fields of artificial muscles and the like.
Has the advantages that: compared with the prior art, the liquid crystal elastomer based on the liquid metal nano microdroplets has the following beneficial effects:
the liquid crystal monomer used in the liquid metal nano-droplet-based liquid crystal elastomer prepared by the invention is 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate. The liquid crystal elastomer has excellent strain performance, shows excellent reversible deformation under thermal stimulation or ultraviolet light stimulation, and the size ratio of the original size to the isotropic phase reaches 2.22;
secondly, the liquid crystal elastomer based on the liquid metal nano liquid drops prepared by the invention has excellent toughness. Dynamic thermodynamic tests show that the liquid crystal elastomer based on the liquid metal nano liquid drops has the elongation at break of 1010.87% at room temperature and the toughness of 18.31MJ/m3The performance is 1 order of magnitude higher than that of the traditional liquid crystal elastomer;
the liquid crystal elastomer based on the liquid metal nano liquid drops prepared by the invention has 72% of linear viscoelastic region in the dynamic thermo-mechanical analyzer test; under the condition of repeatedly stretching to 70 percent of the original length and releasing, the composite material can bear more than 10000 stretching cycles without obvious reduction of mechanical properties. Is 2 orders of magnitude higher than the traditional liquid crystal elastomer and is hundreds times higher than the traditional liquid crystal elastomer.
The liquid crystal elastomer based on the liquid metal nano liquid drops prepared by the method has super-strong fatigue resistance far higher than that of the common liquid crystal elastomer. The method can be beneficial to realizing the industrial application of the liquid crystal elastomer, such as the application in the field of bionic materials such as artificial muscles and the like.
In the composite material, the liquid metal is dispersed in the liquid crystal elastomer in a nano level, the composite material is not conductive, but the clearing point of the composite material is obviously reduced, the mechanical property is obviously improved, and particularly the fatigue resistance is realized.
Drawings
FIG. 1 is a graph of shrinkage stress versus strain for cyclic testing of a prepared liquid metal nanodrop-based liquid crystal elastomer in a dynamic thermomechanical analyzer;
fig. 2 is a graph of storage modulus and elasticity versus strain for a dynamic thermomechanical analyzer for a prepared liquid crystal elastomer based on liquid metal nanodroplets.
The specific implementation mode is as follows:
firstly, liquid crystal monomers, a chain extender, a cross-linking agent, a catalyst and liquid metal are subjected to ultrasonic crushing treatment and then are uniformly mixed. Under the condition of thermal polymerization, liquid crystal elastomer (LM-LCE) based on liquid metal nano liquid drops is prepared. The liquid crystal monomer is 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate (Y2003), the chain extender is 2, 2-oxybis (ethane-1-thiol) (DMDE), the cross-linking agent is pentaerythritol tetrakis (3-mercaptopropionate) (PETMP), and the liquid metal is gallium indium tin alloy (the mass ratio is 0.62:0.25: 0.13).
The liquid crystal elastomer based on the liquid metal nano liquid drops prepared by the method has ultrahigh fatigue resistance, and the liquid crystal elastomer composite material can bear an unprecedented linear viscoelastic region of 72 percent, 10,000 times of stretching cycle (under the deformation with the maximum value of 70 percent), 2,000 times of continuous actuation deformation and the stretching deformation with the maximum value of more than 1000 percent. In addition, the LCE composite material doped with LM has large reversible deformation (maximum: 55%), high actuating stress (maximum: 1.13MPa), completely reversible thermal/optical driving function and excellent self-healing capability under mild conditions. The mechanical property, especially the fatigue resistance, of the composite liquid crystal elastomer material is greatly improved, and the soft actuator material based on the liquid crystal elastomer and long-term industrial application beyond the soft actuator material can be effectively promoted.
The present invention is further illustrated by the following specific examples.
I preparation of liquid-crystalline elastomers based on liquid-metal nanodroplets
According to the following proportion: the mass ratio of the liquid crystal monomer Y2003 to the chain extender DMDE to the cross-linking agent PETMP is 1:20: 22; the mass ratio of the liquid metal to the liquid crystal monomer, the chain extender and the cross-linking agent is 1: 20. Weighing related monomers, a chain extender, a cross-linking agent, a catalyst and liquid metal, and adding the monomers, the chain extender, the cross-linking agent, the catalyst and the liquid metal into a 10mL brown strain bottle; adding dichloromethane; carrying out ultrasonic treatment for 1h by using an ultrasonic crusher to uniformly mix the mixture; pouring the obtained solution into a Polytetrafluoroethylene (PTFE) mould, and then putting the mould into a drying oven at 40 ℃ for heat preservation for 1.5 h; the resulting pre-crosslinked LM-LCE-5 sample was then carefully winged removed from the PTFE mold; stretching it to about 270% of its original strength after cutting and keeping it fixed; the obtained sample was placed in an oven and kept at 40 ℃ for 10 hours to obtain an LM-LCE sample.
The liquid crystal monomer 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate has the following structural formula:
Figure BDA0003226441570000061
the cross-linking agent pentaerythritol tetra (3-mercaptopropionate) has the following structural formula:
Figure BDA0003226441570000062
the chain extender 2, 2-oxybis (ethane-1-mercaptan) has the following structural formula:
Figure BDA0003226441570000063
the catalyst dipropylamine has the following structural formula:
Figure BDA0003226441570000064
II, stress-strain, toughness, reversible deformation, maximum actuating stress, a linear viscoelastic region, ultraviolet light driving, and shrinkage force and self-repairing tests of the liquid crystal elastomer based on the liquid metal nano liquid drops are carried out;
stress-strain test: stress-strain testing was performed at room temperature using a universal tensile tester (SANS E42.503).
Measurement of toughness: integrating the stress-strain curve measured in the step I, and calculating the area enclosed by the curve and the X axis of the abscissa, namely the toughness.
Testing reversible deformation: using a dynamic thermomechanical analyzer (DMAQ850, TA), the length of the film at a certain point in time (L) and the shortest length of the film in the isotropic state (L) were recorded in the direction of the stretching orientation in an iso-stress mode with cyclic temperature increase and decreaseiso) Ratio of (d) and cycle number.
Testing the maximum actuating stress: the shrinkage force test during temperature rise was performed in an iso-strain mode using a dynamic thermomechanical analyzer (DMAQ850, TA).
Testing a linear viscoelastic region: the maximum linear viscoelastic region of the liquid crystal elastomer based on the liquid metal nano-droplet is prepared by testing in a shaking mode by using a dynamic thermomechanical analyzer (DMAQ850, TA).
Sixthly, ultraviolet light drive test: the LM-LCE film in a naturally sagging state was irradiated with a 365nm UV light source, and the length of the sample was recorded as a function of the UV irradiation time.
And (c) self-repairing test: and cutting off an LM-LCE film sample, splicing, placing at 40 ℃ for 10 hours, observing the self-repairing effect by using a metallographic microscope and a scanning electron microscope, and performing stress-strain test after repairing by using a universal tensile tester (SANS E42.503).
Example 1: the liquid crystal elastomer based on the liquid metal nano liquid drops comprises the following specific preparation steps:
weighing liquid crystal monomer Y2003(592.5mg, 1.1mmol), chain extender 2,2' -oxybis (ethane-1-thiol) (138.2mg, 1.0mmol), cross-linker pentaerythritol tetrakis (3-mercaptopropionate) (24.4mg, 0.05mmol) and liquid metal (39.7mg) into a 10mL brown strain flask; weighing 6.00 mu L of catalyst dipropylamine, dissolving in dichloromethane (1.8mL), and adding into the brown strain bottle; carrying out ultrasonic treatment for 1h by using an ultrasonic crusher to uniformly mix the mixture; pouring the obtained solution into a Polytetrafluoroethylene (PTFE) mold (3cm long, 2cm wide and 1cm deep), and then putting the mold into a drying oven at 40 ℃ for heat preservation for 1.5 h; the resulting pre-crosslinked LM-LCE-5 sample was then carefully winged removed from the PTFE mold; stretching it to about 270% of its original strength after cutting and keeping it fixed; the sample was placed in an oven and kept at 40 ℃ for 10 hours to obtain an LM-LCE-5 sample.
Example 2: the prepared liquid crystal elastomer based on the liquid metal nano liquid drops is subjected to stress-strain, toughness, reversible deformation, maximum actuating stress, a linear viscoelastic region, ultraviolet light driving, and shrinkage force and self-repairing tests in the heating process;
stress-strain test: the maximum elongation at break was 1010.87% as measured by stress-strain testing at different temperatures in an iso-strain mode using a universal tensile tester (SANS E42.503).
Measurement of toughness: integrating the stress-strain curve measured in the step I, and calculating the area enclosed by the curve and the X axis of the abscissa, wherein the result is as follows: 18.31MJ/m3。
Testing reversible deformation: using a dynamic thermomechanical analyzer (DMAQ850, TA), the length of the film at a certain point in time (L) and the shortest length of the film in the isotropic state (L) were recorded in the direction of the stretching orientation in an iso-stress mode with cyclic temperature increase and decreaseiso) The maximum ratio of (A) to (B) is 2.22, and the cycle time of the completely reversible deformation reaches 2000 times.
Fourthly, testing the shrinkage stress in the temperature rising process: the shrinkage force test of the temperature rise process was performed in an iso-strain mode using a dynamic thermomechanical analyzer (DMA Q850, TA). The temperature is raised from 30 ℃ to 80 ℃, and then the temperature is lowered from 80 ℃ to 30 ℃, and the maximum shrinkage stress generated by the temperature is measured to be 1.13 MPa.
Testing a linear viscoelastic region: the maximum linear viscoelastic region of the liquid crystal elastomer based on the liquid metal nano-droplets was prepared by testing in an oscillation mode using a dynamic thermomechanical analyzer (DMAQ850, TA corporation), and the maximum linear viscoelastic region was 72% as measured at a set frequency of 1 HZ.
Sixthly, ultraviolet light drive test: irradiating LM-LCE film in a naturally sagging state with 365nm ultraviolet light at 0.4W/cm2Under the irradiation of ultraviolet light, the length (L) of the recording film at a certain time in the direction of the stretching orientation and the shortest length (L) of the film in the isotropic state are recordediso) The maximum ratio of (a) was measured to be 2.22.
And (c) self-repairing test: and cutting off an LM-LCE film sample, splicing, placing at 40 ℃ for 10 hours, observing the self-repairing effect by using a metallographic microscope and a scanning electron microscope, and performing stress-strain test after repairing by using a universal tensile tester (SANS E42.503). The test result shows that the self-repairing efficiency of the liquid crystal elastomer composite material is 80%.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and it should be noted that: it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended to cover in the appended claims all such changes and modifications that fall within the true spirit and scope of the invention.

Claims (10)

1. A liquid crystal elastomer material based on liquid metal nano liquid drops is characterized in that the liquid crystal elastomer material is formed by polymerizing liquid crystal monomers, after polymerization, the liquid crystal monomers are orderly arranged in a molecular chain in a liquid crystal element mode along a stretching direction to form a molecular main chain, and liquid metal is crushed into nano-scale micro-droplets which then have dynamic interaction with sulfur elements in the molecular main chain to be uniformly and stably dispersed in a liquid crystal elastomer matrix.
2. Liquid metal nano droplet based liquid crystal elastomeric material according to claim 1, characterized in that said liquid crystal monomer is 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate.
3. Liquid crystal elastomeric material based on liquid metal nanodroplets according to claim 1, characterized in that said liquid metal is gallium indium tin alloy, the mass ratio of gallium, indium and tin being 0.62-0.8: 0.25-0.1: 0-0.13.
4. Liquid crystal elastomeric material based on liquid metal nano droplets according to claim 1, characterized in that the mass ratio of liquid metal to liquid crystal monomer is comprised between 5% and 8%.
5. A method for preparing a liquid crystal elastomer material based on liquid metal nano droplets as claimed in claim 1, characterized in that the preparation process is as follows:
step 1, carrying out water removal treatment on a liquid crystal monomer 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate, a chain extender 2, 2-oxybis (ethane-1-thiol), a cross-linking agent pentaerythritol tetra (3-mercaptopropionate) and liquid metal;
step 2, putting all the materials in the step 1 into anhydrous dichloromethane, and then putting the materials into a brown strain bottle to be fully stirred under the condition of introducing nitrogen to form a uniform solution;
step 3, dissolving a catalyst dipropylamine in dichloromethane, and then adding the solution into the brown strain bottle;
step 4, carrying out ultrasonic treatment for 1-1.5h by using an ultrasonic crusher to crush the liquid metal into nano-grade metal, and realizing uniform mixing of the mixture;
step 5, pouring the mixture into a polytetrafluoroethylene groove, and then putting the polytetrafluoroethylene groove into a 36-45 ℃ oven for heat preservation for 1-1.5 h;
step 6, cooling the polytetrafluoroethylene groove in the step 5 to room temperature to prepare an unoriented liquid crystal elastomer material LM-LCE film based on liquid metal nano liquid drops;
step 7, cutting the unoriented LM-LCE film into a long strip, stretching at room temperature and keeping the long strip fixed to obtain a stretched and oriented LM-LCE film made of liquid crystal elastomer materials based on liquid metal nano liquid drops;
and 8, putting the stretched and oriented long-strip LM-LCE film prepared in the step 7 into an oven, keeping the temperature of the oven at 36-45 ℃ for 8-11h, and naturally cooling the film to room temperature to prepare the liquid crystal elastomer material LM-LCE film based on the liquid metal nano liquid drops and having an oriented structure.
6. The method for preparing a liquid crystal elastomer material of liquid metal nano droplets as claimed in claim 5, wherein the liquid crystal monomer 4- ((6- (acryloyloxy) hexyl) oxy) phenyl 4- ((6- (acryloyloxy) hexyl) oxy) benzoate has a structural formula as follows:
Figure FDA0003226441560000021
the cross-linking agent pentaerythritol tetra (3-mercaptopropionate) has the following structural formula:
Figure FDA0003226441560000022
the chain extender 2, 2-oxybis (ethane-1-mercaptan) has the following structural formula:
Figure FDA0003226441560000023
the catalyst dipropylamine has the following structural formula:
Figure FDA0003226441560000024
7. the method for preparing a liquid crystal elastomer material of liquid metal nano droplets as claimed in claim 5, wherein the amount ratio of the liquid crystal monomer to the chain extender and the cross-linking agent substance in step 1 is: liquid crystal monomer Y2003: chain extender DMDE: the cross-linking agent PETMP is 1:20: 22-1: 10: 12;
the mass ratio of the liquid metal to the liquid crystal monomer chain extender to the cross-linking agent is as follows: liquid metal: (liquid crystal monomer + chain extender + crosslinking agent) ═ 1:20 to 1: 12.
8. The method for preparing a liquid crystal elastomer material based on liquid metal nano droplets as claimed in claim 5, wherein the chain extender 2, 2-oxybis (ethane-1-thiol) in the step 1 is replaced by 3, 6-dithio-1, 8-octanediol.
9. The method for preparing a liquid crystal elastomer material based on liquid metal nano droplets as claimed in claim 5, wherein the power of the ultrasonic treatment of the ultrasonic crusher in the step 4 is set to 360W.
10. The method for preparing a liquid crystal elastomer material based on liquid metal nano droplets as claimed in claim 5, wherein the unoriented LM-LCE film cut in step 7 is stretched in a long shape at room temperature to 2-2.7 times the original length and is kept fixed.
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