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High-thermal-conductivity reconfigurable liquid crystal elastomer composite material, and preparation method and application thereof

A technology of liquid crystal elastomers and composite materials, which is applied in the direction of liquid crystal materials, heat exchange materials, chemical instruments and methods, etc., can solve the problems of self-repair function and micro cracks in thermal conductive composite materials, and achieve good thermal conductivity and thermal conductivity. The effect of improving the coefficient and saving the production cost

Pending Publication Date: 2020-09-01
国科广化精细化工孵化器(南雄)有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the thermally conductive composite materials in the prior art have their inherent disadvantages, that is, they do not have the function of self-healing
Conventional thermally conductive composites are prone to microcracks when subjected to external stress during use

Method used

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  • High-thermal-conductivity reconfigurable liquid crystal elastomer composite material, and preparation method and application thereof
  • High-thermal-conductivity reconfigurable liquid crystal elastomer composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing a high thermal conductivity remodelable liquid crystal elastomer composite material, comprising the following steps:

[0053] (1) First prepare a mercapto-terminated liquid crystal prepolymer: 5.33 parts by mass of 4,4'-divinyloxybiphenyl and 5.47 parts by mass of 3,6-dioxa-1,8-octanedithiol are dissolved in In dichloromethane, then add 0.2 parts by mass of photoinitiator 819, at a light intensity of 60mW / cm 2 , the maximum emission wavelength is 365nm UV light reaction for 2 hours, then the reaction mixture was added dropwise in a large amount of methanol to obtain a viscous precipitate, the methanol was removed by pouring, and then the dichloromethane was used to dissolve the product again, and the Precipitation with methanol was repeated 3 times, and the viscous product finally obtained was baked at 60° C. for 12 hours for use.

[0054] (2) 10 parts by mass of the prepolymer obtained in step (1) and 0.67 parts by mass of mercapto crosslinking ...

Embodiment 2

[0058] A method for preparing a high thermal conductivity remodelable liquid crystal elastomer composite material, comprising the following steps:

[0059] (1) First prepare a mercapto-terminated liquid crystal prepolymer: 6.45 parts by mass of 4,4'-bis(allyloxy)-3,3',5,5'-tetramethyl-1,1'-biphenyl Dissolve 3.67 parts by mass of 1,4-butanedithiol in dichloromethane, then add 0.2 parts by mass of photoinitiator 819, at a light intensity of 60mW / cm 2 , the maximum emission wavelength is 365nm UV light reaction for 2 hours, then the reaction mixture was added dropwise in a large amount of methanol to obtain a viscous precipitate, the methanol was removed by pouring, and then the dichloromethane was used to dissolve the product again, and the Precipitation with methanol was repeated 3 times, and the viscous product finally obtained was baked at 60° C. for 12 hours for use.

[0060] (2) 10 parts by mass of the prepolymer obtained in step (1) and 0.59 parts by mass of mercapto cros...

Embodiment 3

[0064] A method for preparing a high thermal conductivity remodelable liquid crystal elastomer composite material, comprising the following steps:

[0065] (1) First prepare a mercapto-terminated liquid crystal prepolymer: 9.77 parts by mass of 2,5-bis[4-(allyloxy)benzoyloxy]benzoate and 4.51 parts by mass of 1,6 hexanedisulfide Dissolve alcohol in dichloromethane, then add 0.2 parts by mass of photoinitiator 184, at a light intensity of 60mW / cm 2 , the maximum emission wavelength is 365nm UV light reaction for 2 hours, then the reaction mixture was added dropwise in a large amount of methanol to obtain a viscous precipitate, the methanol was removed by pouring, and then the dichloromethane was used to dissolve the product again, and the Precipitation with methanol was repeated 3 times, and the viscous product finally obtained was baked at 60° C. for 12 hours for use.

[0066] (2) 10 parts by mass of the prepolymer obtained in step (1) and 0.75 parts by mass of mercapto cross...

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Abstract

The invention belongs to the technical field of polymer composite materials, and discloses a high-thermal-conductivity remoldable liquid crystal elastomer composite material, and a preparation methodand application thereof. The high-thermal-conductivity reconfigurable liquid crystal elastomer composite material is obtained by mixing a sulfydryl-terminated liquid crystal prepolymer with a filler and then carrying out a cross-linking reaction A under the action of a sulfydryl cross-linking agent. The invention also provides a preparation method of the composite material. The preparation methodcomprises the following steps: firstly, preparing a sulfydryl-terminated liquid crystal prepolymer through photoinduced sulfydryl alkene click chemistry; then, the self-repairing liquid crystal elastomer containing the disulfide bond is obtained through an oxidation reaction between the prepolymer and the sulfydryl cross-linking agent; meanwhile, the heat-conducting filler and the like are introduced into the elastomer system in an in-situ polymerization mode, so that the composite material with good heat-conducting property and a recyclable remodeling function is obtained, and the composite material can be applied to the fields of aerospace, microelectronics and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a high thermal conductivity remodelable liquid crystal elastomer composite material and its preparation method and application. Background technique [0002] In recent years, in the field of polymer composite materials, polymer composite materials with high mechanical and high thermal conductivity have gradually become a research hotspot and focus, and have attracted great attention from researchers. This is because, since the information age, the microelectronics industry known for its high integration, miniaturization and multi-function has developed rapidly. This makes electronic equipment generate huge heat in a very small space, making components in a high temperature environment for a long time. Studies have shown that the stability of electronic devices decreases by almost 10% for every 2°C increase in temperature during operation. A large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/045C08K3/04C08K3/38C08J3/24C09K5/14C09K19/02C08L81/02
CPCC08G75/045C08K3/042C08K3/38C08K3/041C08J3/24C09K5/14C09K19/02C08J2381/02C08K2003/385
Inventor 吕满庚张倩吴昆
Owner 国科广化精细化工孵化器(南雄)有限公司
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