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Liquid crystal elastomer driving element and preparation method thereof, and application of liquid crystal elastomer

A technology for liquid crystal elastomers and driving elements, which is applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of disappearance of orientation, poor thermal response repeatability, and solvent intolerant liquid crystal elastomers, and achieves good application prospects. Effect

Active Publication Date: 2018-10-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this kind of scheme at present. For example, the introduction of transesterification system will bring about the problem of poor repeatability of thermal response. Orientation will disappear after exposure to solvents

Method used

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  • Liquid crystal elastomer driving element and preparation method thereof, and application of liquid crystal elastomer
  • Liquid crystal elastomer driving element and preparation method thereof, and application of liquid crystal elastomer
  • Liquid crystal elastomer driving element and preparation method thereof, and application of liquid crystal elastomer

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preparation example Construction

[0031] see Figure 4 , the present invention also provides a method for preparing a liquid crystal elastomer driving element, comprising:

[0032] Step S110, adding liquid crystal molecules, molecules containing allyl sulfide groups, flexible chains, and a crosslinking agent into a solvent to form a mixture solution;

[0033] Step S120, performing a polymerization reaction on the mixture solution, so that liquid crystal molecules, molecules containing allyl sulfide groups, flexible chains and crosslinking agents are polymerized to form a crosslinked network, forming a liquid crystal elastomer; and

[0034] Step S130, performing an alignment treatment on the liquid crystal elastomer to obtain a liquid crystal elastomer driving element.

[0035] The liquid crystal molecule is preferably a mesogen with a rigid structure, a flexible chain structure with 3-6 carbon atoms, and a terminal group that can react with the flexible chain and a cross-linking agent. The terminal groups ar...

Embodiment 1

[0067] 0.45mmol of liquid crystal molecules (RM257), 0.05mmol of 5-methyl-benzotriazole (MBTA), 0.455mmol of 2,2'-(ethylenedioxy)diethanethiol (DODT) and 0.023mmol Pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) was dissolved in dichloromethane to obtain a mixed solution. Oxidize 2,2-dimethoxy-1,2-diphenylethan-1-one (Irgacure651) and 1 wt% bis(2,4,6-trimethylbenzoyl)phenyl Phosphine (Irgacure 819) was added to the mixed solution, and 10 wt% of dipropylamine was dissolved in methylene chloride and added to the mixed solution to form a reactant solution. The reactant solution is quickly poured on the substrate and spread out to carry out the polymerization reaction and apply pressure to form a liquid crystal elastomer. The liquid crystal elastomer was taken out and dried to obtain a sheet-like liquid crystal elastomer.

[0068] For the lamellar liquid crystal elastomer with the original length, stretching along the length direction for the first time makes its length b...

Embodiment 2

[0071] 0.45mmol of liquid crystal molecules (RM257), 0.05mmol of 5-methyl-benzotriazole (MBTA), 0.455mmol of 2,2'-(ethylenedioxy)diethanethiol (DODT) and 0.023mmol Pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) was dissolved in dichloromethane to obtain a mixed solution. Oxidize 2,2-dimethoxy-1,2-diphenylethan-1-one (Irgacure651) and 1 wt% bis(2,4,6-trimethylbenzoyl)phenyl Phosphine (Irgacure 819) was added to the mixed solution, and 10 wt% of dipropylamine was dissolved in methylene chloride and added to the mixed solution to form a reactant solution. The reactant solution is quickly poured on the substrate and spread out to carry out the polymerization reaction and apply pressure to form a liquid crystal elastomer. The liquid crystal elastomer was taken out and dried to obtain a sheet-like liquid crystal elastomer.

[0072] Prepare a flat plate with pin protrusions, the vertical distance from the end of the pin protrusion to the flat plate is about 5mm. Spread the...

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Abstract

The invention relates to a liquid crystal elastomer driving element which comprises a liquid crystal elastomer. The liquid crystal elastomer can reversibly deform near the liquid crystal transformation temperature. The liquid crystal elastomer has a crosslinked network which comprises liquid crystal molecules connected with one another, molecules containing diallyl sulfide groups, a flexible chain and a crosslinking agent. The invention also relates to a preparation method of the liquid crystal elastomer driving element. The preparation method comprises the following steps of: adding the liquid crystal molecules, the molecules containing diallyl sulfide groups, the flexible chain and the crosslinking agent into a solvent to form a mixture solution; performing a polymerization reaction on the mixture solution, wherein the liquid crystal molecules, the molecules containing diallyl sulfide groups, the flexible chain and the crosslinking agent are polymerized to form a crosslinked network to form the liquid crystal elastomer; and orienting the liquid crystal elastomer to obtain the liquid crystal elastomer driving element. The invention also relates to application of the liquid crystal elastomer which is used as a driving element and is applied to an artificial muscle, a blind person display, a sensor, a micro-fluid system valve or an intelligent responding interface material.

Description

technical field [0001] The invention relates to the field of liquid crystal elastomer drive elements, in particular to a liquid crystal elastomer drive element, a preparation method thereof, and an application of the liquid crystal elastomer. Background technique [0002] The liquid crystal elastomer driving element is a kind of stimulus-responsive material with both the entropy elasticity of the elastomer and the orderliness of the liquid crystal. It can produce reversible mechanical responses under the stimulation of light, heat, electricity, etc., in the driver, sensor , artificial muscles and optical motors have broad application prospects. However, the liquid crystal elastomer driving element can exhibit reversible mechanical response driving only when the internal mesogens have a uniform orientation and are fixed. After the liquid crystal elastomer is prepared, it generally needs to undergo special orientation processing before it can have a fixed orientation and be u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/38C08F222/20C08F222/24
CPCC08F222/20C09K19/3852C08F222/24
Inventor 吉岩危岩钱晓杰
Owner TSINGHUA UNIV