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Method for preparing backbone chain type liquid crystal elastomer

A liquid crystal elastomer, main chain type technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of complex network structure, and achieve the effect of clear structure, easy control of crosslinking degree, and difficult to gel

Inactive Publication Date: 2008-01-30
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the competition between the two reactions of the epoxy group itself to form an ether or to form an ester with a carboxylic acid, the network structure formed by them is very complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) 10mmol of two-(4-allyloxybenzoic acid) hydroquinone, 7mmol of hydrogen-containing polysiloxane, 6mmol of triethoxysilane and 0.01% H of the total mass of reactants 2 PtCl 6 , added to a 50ml round bottom flask;

[0022] (2) Add 15ml of dry toluene to the reaction flask, and react under electromagnetic stirring at 100°C for 10 hours to obtain a prepolymer reaction liquid;

[0023] (3) Pour the above-mentioned prepolymer reaction solution directly into the mold, and the solvent is naturally volatilized, and the siloxane is hydrolyzed and cross-linked by using the moisture in the air to form a crude liquid crystal elastomer with a cross-linked network structure, and baked in an ordinary oven at 80°C for 8 hours , to complete the hydrolysis and crosslinking of siloxane;

[0024] (4) Stretching the crude liquid crystal elastomer with a tensile strength of 1000 Pa for 50 hours to obtain a finished liquid crystal elastomer.

Embodiment 2

[0026] (1) 1mmol of two-(4-allyloxybenzoic acid) biphenyl diphenol ester, 1.2mmol of hydrogen-containing polysiloxane, 0.4mmol of vinyltriethoxysilane and a total mass of reactants of 0.05 %H 2 PtCl 6 added to the reaction flask;

[0027] (2) Add 5ml of dry dioxane to the reaction flask, and react under electromagnetic stirring at 80°C for 40 hours to obtain a prepolymer reaction solution;

[0028] (3) Pour the above-mentioned prepolymer reaction solution directly into the mold, and the solvent is naturally volatilized, and the siloxane is hydrolyzed and cross-linked by using the moisture in the air to form a crude liquid crystal elastomer with a cross-linked network structure, and baked in an ordinary oven at 60°C for 30 hours , to complete the hydrolysis and crosslinking of siloxane;

[0029] (4) Stretching the crude liquid crystal elastomer with a tensile strength of 100 Pa for 100 hours to obtain a finished liquid crystal elastomer.

Embodiment 3

[0031] (1) 10mmol of 2,5-bis-[(4-allyloxy)benzoyloxy]n-hexyl benzoate, 6.5mmol of hydrogen-containing polysiloxane, 7mmol of trimethoxysilane and reaction 0.005% H in total mass 2 PtCl 6 added to the reaction flask;

[0032] (2) Add 15ml of dry tetrahydrofuran into the reaction flask, and react under electromagnetic stirring at 60°C for 72 hours to obtain a prepolymer reaction liquid;

[0033] (3) Pour the above-mentioned prepolymer reaction solution directly into the mold, and the solvent is naturally volatilized, and the siloxane is hydrolyzed and cross-linked by using the moisture in the air to form a crude liquid crystal elastomer with a cross-linked network structure, and baked in an ordinary oven at 70°C for 20 hours , to complete the hydrolysis and crosslinking of siloxane;

[0034] (4) Stretching the crude liquid crystal elastomer, the tensile strength is 10 4 Pa, the time is 60 hours to obtain the finished liquid crystal elastomer.

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Abstract

The invention provides a preparation method of a backbone liquid crystal elastomer. A prepolymer is made from the silicon hydrogen addition reaction with the materials of diene monomer containing mesogenic units, polysiloxane containing hydrogen and silane coupling agent under the function of catalyst, then the prepolymer is fabricated into a low crosslinked density network structure containing mesogenic units connects through the hydrolysis of siloxane, finally the liquid crystal elastomer is acquired through suitable stretching. The method is characterized by simple operation, being difficult to be gel, and easy control for elastomer crosslinked density, etc.

Description

technical field [0001] The invention relates to the preparation technology of the main chain type liquid crystal elastomer, specifically refers to the preparation method of the main chain type liquid crystal elastomer. Background technique [0002] In today's world, the ever-changing material science is developing towards multifunctionality and high orientation. A typical representative of this supramolecular system is liquid crystal elastomer (LCE). LCE is developed on the basis of liquid crystal polymers, which have low crosslink density and have dual properties of elastomers and liquid crystals. Because of its special properties such as orientation, ferroelectricity, piezoelectricity and optical nonlinearity under the action of mechanical force field, it can not only be used to prepare piezoelectric sensors, but also can be used in non-porous filter membranes and nonlinear optical materials Therefore, the research on the molecular design, structure and structure and prop...

Claims

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Application Information

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IPC IPC(8): C08G77/48C08G77/42C08J5/00C09K19/38
Inventor 梁利岩吕满庚凌有道梅群波
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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