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Liquid crystal elastomer and preparation method thereof and liquid crystal driving element

A technology of liquid crystal elastomers and liquid crystal monomers, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of inability to further elongate, large energy consumption, severe conditions, etc., and achieve excellent stability and high driving stability. Effect

Pending Publication Date: 2021-10-22
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have a certain degree of difficulty in operation, the conditions are relatively severe, and require large energy consumption.
[0004] In addition, under the condition of constant external conditions, all known liquid crystal elastomers can only undergo elastic or plastic deformation after being stretched. No matter what kind of deformation occurs, when they are stretched and fixed at both ends Can maintain the current length and cannot be further elongated without external stimuli

Method used

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  • Liquid crystal elastomer and preparation method thereof and liquid crystal driving element
  • Liquid crystal elastomer and preparation method thereof and liquid crystal driving element
  • Liquid crystal elastomer and preparation method thereof and liquid crystal driving element

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preparation example Construction

[0023] The invention provides a preparation method of a liquid crystal elastomer, which comprises the step (a) of obtaining a liquid crystal elastomer through polymerization reaction of a liquid crystal monomer, a chain extender and a crosslinking agent.

[0024] In step (a), the liquid crystal monomer is selected from double-ended acrylate liquid crystal monomers. In some embodiments, both ends of the main chain of the double-ended acrylate liquid crystal monomer are acrylate groups. In some embodiments, preferably, the liquid crystal monomer is selected from compounds described in formula (I).

[0025]

[0026] In formula (I), R 1 , R 2 , R 3 , R 4 independently represent hydrogen or methyl, R 5 and R 6 Each independently represents a C3-C6 alkylene group.

[0027] In some embodiments, R 1 , R 2 , R 3 , R 4 One or more of them represent a methyl group. Optionally, R 1 , R 2 , R 3 , R 4 One of them represents a methyl group, and the rest represent hydrogen....

Embodiment 1

[0060] At 25°C, 0.8 mmol of liquid crystal monomer RM257, 0.6 mmol of chain extender 2,2'-(1,2-ethylenedioxy)diethanethiol and 0.1 mmol of crosslinking agent tetrakis(3-mercapto Propionate) pentaerythritol ester was added to dichloromethane to obtain a mixed solution. The total mass fraction of liquid crystal monomer, chain extender and crosslinking agent in the mixed solution is 20wt%. Based on the total mass of the liquid crystal monomer, the chain extender and the crosslinking agent in the mixed solution, 1 wt% of the catalyst dipropylamine was added to the mixed solution. The mixed solution containing the catalyst was poured into a polytetrafluoroethylene mold, and polymerized at 25° C. for 12 hours. After the reaction, the polymer is released from the mold to obtain a liquid crystal elastomer.

[0061] refer to figure 1 , the liquid crystal elastomer was cut into strips with a length of 15mm, a width of 1.5mm, and a thickness of 0.12mm, and uniaxially stretched along t...

Embodiment 2

[0064]At 25°C, 0.8 mmol of liquid crystal monomer RM257, 0.6 mmol of chain extender 2,2'-(1,2-ethylenedioxy)diethanethiol and 0.1 mmol of crosslinking agent tetrakis(3-mercapto Propionate) pentaerythritol ester was added to dichloromethane to obtain a mixed solution. The total mass fraction of liquid crystal monomer, chain extender and crosslinking agent in the mixed solution is 20wt%. Based on the total mass of the liquid crystal monomer, the chain extender and the crosslinking agent in the mixed solution, 1 wt% of the catalyst dipropylamine was added to the mixed solution. The mixed solution containing the catalyst was poured into a polytetrafluoroethylene mold, and polymerized at 25° C. for 12 hours. After the reaction, the polymer is released from the mold to obtain a liquid crystal elastomer.

[0065] Cut the liquid crystal elastomer with a thickness of 0.15mm as image 3 In the cruciform shape shown, the four arms are equal in size, each 8mm long and 1.2mm wide. The ...

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Abstract

The invention provides a liquid crystal elastomer and a preparation method thereof and a liquid crystal driving element. The liquid crystal elastomer is obtained by polymerizing a liquid crystal monomer, a chain extender and a cross-linking agent, wherein the liquid crystal monomer is selected from a double-end acrylate liquid crystal monomer, the chain extender is selected from a dimercapto monomer, and the cross-linking agent is selected from one or more of a trithiol monomer and a tetrathiol monomer. After the liquid crystal elastomer is stretched at room temperature and two ends of the elastomer are fixed, the elastomer can still be further stretched spontaneously. The self-elongated liquid crystal elastomer is further placed at room temperature, a single domain can be fixed, and the single-domain liquid crystal elastomer is obtained.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a liquid crystal elastic body, a preparation method thereof, and a liquid crystal driving element. Background technique [0002] Liquid crystal elastomers (LCEs) are a class of smart materials that possess both entropic elasticity and liquid crystallinity. LCEs can undergo reversible changes under external stimuli, so they can be used as actuating devices, such as artificial muscles, microfluidic system valves, etc. [0003] The prerequisite for the driving performance of LCEs is the formation of monodomain liquid crystal elastomers. Monodomain refers to the orderly arrangement of mesogens in the cross-linked network to form a uniform orientation. Monodomain LCEs are anisotropic phases (liquid crystal phases) below the liquid crystal transition temperature (Ti), with ordered mesogens, and are isotropic phases above Ti, with disordered mesogens. Whe...

Claims

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Application Information

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IPC IPC(8): C08G75/045C09K19/38
CPCC08G75/045C09K19/3804
Inventor 吉岩梁欢
Owner TSINGHUA UNIV
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