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Liquid crystal polyacrylate-liquid crystal polyurethane interpenetrating network liquid crystal elastomer

A technology of polyacrylate and liquid crystal elastomer, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve problems such as insufficient stress, and achieve the effects of excellent reversible deformation, excellent strain performance, and excellent strain capacity

Active Publication Date: 2019-10-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The object of the present invention is to provide a liquid crystal polyacrylate / liquid crystal polyurethane interpenetrating network liquid crystal elastomer, which is at T i The above shows super strong mechanical properties, which solves the problem of insufficient stress in the braking process of traditional liquid crystal elastomer materials, and provides a preparation method for this material

Method used

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  • Liquid crystal polyacrylate-liquid crystal polyurethane interpenetrating network liquid crystal elastomer
  • Liquid crystal polyacrylate-liquid crystal polyurethane interpenetrating network liquid crystal elastomer
  • Liquid crystal polyacrylate-liquid crystal polyurethane interpenetrating network liquid crystal elastomer

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Embodiment 1

[0046] Embodiment 1: The specific preparation steps of liquid crystal polyacrylate / liquid crystal polyurethane interpenetrating network liquid crystal elastomer are as follows:

[0047] Weigh liquid crystal acrylate monomer RM82 (0.672g, 1mmol), aliphatic acrylate monomer HODA (0.023g, 0.1mmol), photoinitiator-benzoin dimethyl ether DMPA (0.003g, 0.011mmol), polyurethane liquid crystal monomer Body Y1901 (0.43g, 1mmol), polyethylene glycol PEG400 (0.268g, 0.67mmol), 4,4-methylene diisocyanate phenyl MDI (0.445g, 1.78mmol), trimethylolpropane TMP (0.008g, 0.06mmol) and dibutyltin dilaurate DBTL (0.021g, 0.03). After water removal treatment, 35 mL of anhydrous N,N-dimethylformamide was added. Under the condition of blowing nitrogen, react at 70-80°C for 4.5h. After the reaction is over, about 90% of the solvent is removed, and after waiting for the system to become viscous, at 6.9mW.cm -2 Under 365nm ultraviolet irradiation (10-20s), quickly inject it into the polytetrafluoro...

Embodiment 2

[0048] Example 2: The prepared liquid crystal polyacrylate / liquid crystal polyurethane interpenetrating network liquid crystal elastomer at different temperatures stress-strain, deformation, strain under the maximum load state, shrinkage force and load-bearing capacity test during the heating process;

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Abstract

The invention discloses a liquid crystal polyacrylate / liquid crystal polyurethane interpenetrating network liquid crystal elastomer and preparation method and application thereof. Liquid crystal acrylate belongs to a first network, liquid crystal polyurethane belongs to a second network. Under the conditions of thermal polymerization and photoinitiation, mutually independent systems of the two liquid crystal systems are simultaneously polymerized to prepare a double liquid crystal system interpenetrating network liquid crystal elastomer (IPN-LCE). According to the preparation method ofliquid crystal polyacrylate / liquid crystal polyurethane interpenetrating network liquid crystal elastomer, theprepared interpenetrating network liquid crystal elastomer is ultra-high in mechanical propertiesand has a breaking strength of up to 7.9 MPa and an elastic modulus of 10.4 MPa at the isotropyphase inversion temperatureTi relative to theliquid crystal. Under thermal stimulation, a restoring forceof 2.53 MPa can be produced, the interpenetrating network liquid crystal elastomer with weight of 30,000 times that of the load is lifted. The liquid crystal polyacrylate / liquid crystal polyurethaneinterpenetrating network liquid crystal elastomer, mechanical properties are ultra-high,the high practical application value is realized, and the interpenetrating network liquid crystal elastomer canbe used in the fields such as shape memory materials and artificial muscles.

Description

technical field [0001] The invention relates to the field of liquid crystal elastomers, in particular to an interpenetrating network liquid crystal elastomer with super-strong mechanical properties formed by interpenetrating a liquid crystal acrylate crosslinked network and a liquid crystal polyurethane crosslinked network. Background technique [0002] As a two-way shape memory material, liquid crystal elastomer has become a hot research field because of its large deformation and excellent reversible deformation. In the nearly 40 years since Finklemann first prepared liquid crystal elastomers in 1981, hundreds of studies on liquid crystal elastomers have been reported. But it has not yet achieved real industrial application. This is mainly due to the fact that the stress of the liquid crystal elastomer is too small during the braking process under the condition of external stimuli, and the material is easily damaged. In 1997, de Gennes proposed the application of liquid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L35/02C08F222/20C08F222/14C08G18/76C08G18/32C09K19/38
CPCC08L75/04C08F222/1006C08G18/7671C08G18/3206C08G18/3215C09K19/3885C09K19/3852C08L2205/04C08F222/102C08L35/02
Inventor 杨洪陆海峰王猛
Owner SOUTHEAST UNIV
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