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Self-healing liquid crystalline elastomer based on chitin-type liquid crystal and preparation method of self-healing liquid crystalline elastomer

A technology of shell-type liquid crystal and liquid crystal elastomer, which is applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of easy aging of materials and disappearance of light response, and achieve the effects of enriching varieties, reducing cracks and improving comprehensive performance.

Inactive Publication Date: 2015-04-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid crystal elastomer optical materials and polymer materials have the advantages of high light damage threshold, fast response speed, and easy design and processing, but the disadvantage of these materials is that the light response disappears after the material is aged.
At the same time, liquid crystal elastomers are developing in the direction of multi-functionality, intelligence and life. Some people have reported ionic liquid crystal elastomers and biological liquid crystal elastomers. In 2000, Finkelmalin reported that liquid crystal elastomers may be used to make artificial muscles. These all indicate that liquid crystal elastomers can be used as functional polymer materials to make life medical materials, but these materials all face the disadvantage of easy aging

Method used

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  • Self-healing liquid crystalline elastomer based on chitin-type liquid crystal and preparation method of self-healing liquid crystalline elastomer
  • Self-healing liquid crystalline elastomer based on chitin-type liquid crystal and preparation method of self-healing liquid crystalline elastomer
  • Self-healing liquid crystalline elastomer based on chitin-type liquid crystal and preparation method of self-healing liquid crystalline elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A self-healing liquid crystal elastomer based on carapace liquid crystal, its structural formula is:

[0053]

[0054] A method for preparing a self-healing liquid crystal elastomer based on a shell-type liquid crystal;

[0055] Raw materials: vinyl terephthalic acid, 1,6-dibromohexane, hexamethylene diisocyanate, tetrahydrofuran (THF), 2-hydroxyethyl acrylate, 2-amino-4-hydroxy-6-methyl pyrimidine.

[0056] Liquid crystal monomer containing double bond 1: Vinyl hexylene terephthalate

[0057]Monomer 2 with double and hydrogen bonded groups: 2-[6-(6-Methyl-4-pyrimidinone)-urea-hexamethylenecarbamate]-ethylacrylate

[0058] Initiator: Azobisisobutyronitrile (AIBN)

[0059] Liquid crystal monomer 1 (0.5g, 1.39mmol) containing double bonds, monomer 2 (0.11g, 0.278mmol) containing double bonds and hydrogen bond groups, and initiator AIBN (0.00278g, 0.017mmol) were added to Add 1.5 ml of tetrahydrofuran (THF) as a solvent to the test tube equipped with a magnet, and s...

Embodiment 2

[0061] A self-healing liquid crystal elastomer based on crustacean liquid crystal, the structural formula of which is shown in formula V.

[0062] Raw materials: vinyl terephthalic acid, 1,6-dibromohexane, hexamethylene diisocyanate, tetrahydrofuran (THF), 2-hydroxyethyl acrylate, 2-amino-4-hydroxy-6-methyl pyrimidine.

[0063] Liquid crystal monomer containing double bond 1: Vinyl hexylene terephthalate

[0064] Monomer 2 with double and hydrogen bonded groups: 2-[6-(6-Methyl-4-pyrimidinone)-urea-hexamethylenecarbamate]-ethylacrylate

[0065] Initiator: Azobisisobutyronitrile (AIBN)

[0066] Liquid crystal monomer 1 (0.5g, 1.39mmol) containing double bonds, monomer 2 (0.055g, 0.139mmol) containing double bonds and hydrogen bond groups, and initiator AIBN (0.0025g, 0.015mmol) were added to the Add 1.5 ml of tetrahydrofuran (THF) as a solvent to the test tube equipped with a magnet, and seal the tube under vacuum after three times of freezing-pumping-thawing. Place the test...

Embodiment 3

[0068] A self-healing liquid crystal elastomer based on crustacean liquid crystal, the structural formula of which is shown in formula V.

[0069] Raw materials: vinyl terephthalic acid, 1,6-dibromohexane, hexamethylene diisocyanate, tetrahydrofuran (THF), 2-hydroxyethyl acrylate, 2-amino-4-hydroxy-6-methyl pyrimidine.

[0070] Liquid crystal monomer containing double bond 1: Vinyl hexylene terephthalate

[0071] Monomer 2 with double and hydrogen bonded groups: 2-[6-(6-Methyl-4-pyrimidinone)-urea-hexamethylenecarbamate]-ethylacrylate

[0072] Initiator: Azobisisoheptanonitrile (ABVN)

[0073] Liquid crystal monomer 1 (0.5g, 1.39mmol) containing double bonds, monomer 2 (0.11g, 0.278mmol) containing double bonds and hydrogen bond groups, and initiator AIBN (0.00278g, 0.017mmol) were added to Add 1.5 ml of tetrahydrofuran (THF) as a solvent to the test tube equipped with a magnet, and seal the tube under vacuum after three times of freezing-pumping-thawing. Place the test tu...

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Abstract

The invention discloses a self-healing liquid crystalline elastomer based on a chitin-type liquid crystal and a preparation method of the self-healing liquid crystalline elastomer. According to the self-healing liquid crystalline elastomer disclosed by the invention, the chitin-type liquid crystalline elastomer with the self-healing capability is constructed by introducing a reversible covalent-multiple hydrogen bond; due to self-healing introduction, cracks in the material can be remarkably reduced, the comprehensive performances and the reusability of the material are improved, and the service life of the material is prolonged. The preparation method comprises the following steps: firstly, selecting proper reaction materials and reaction paths, synthesizing a monomer containing the multiple hydrogen bond and a side group, with a large volume, containing a mesogenic unit, carrying out reaction on the monomer and the side group by virtue of a liquid crystalline monomer with connection of a short spacer and a double bond under the proper reaction conditions to design and synthesize a chitin-type effect polymer, regulating the dosage of a hydrogen bond crosslinking agent, and preparing the chitin-type self-healing liquid crystalline elastomers in different crosslinking degrees under the condition without influencing the liquid crystallinity.

Description

technical field [0001] The invention relates to a liquid crystal elastomer and a preparation method thereof. Background technique [0002] Polymer liquid crystals combine the orderliness of liquid crystals and the excellent properties of polymer materials. Shell-type liquid crystal polymers refer to a type of liquid crystal polymers in which mesogens are connected to the main chain of the polymer at the center of gravity (or waist) through a covalent bond or a very short spacer. Due to the strong interaction between the side groups and the main chain, many large rigid side groups will force the flexible main chain to adopt the conformation of the straight chain, so that the whole molecule has columnar characteristics. These characteristics make the shell-type liquid crystal polymer an effective The third type of liquid crystal polymer is different from the main chain type and side chain type. The side groups of the shell-type liquid crystal polymers are generally wrapped a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F222/40C08F212/34C09K19/38
Inventor 谢鹤楼唐军晏苗倪彬钟冠群张海良
Owner XIANGTAN UNIV
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