Intrinsic high-flexibility and high-thermal-conductivity liquid crystal elastomer material as well as preparation and application thereof

A liquid crystal elastomer and highly flexible technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of poor flexibility, complex preparation of thermally conductive liquid crystal polymer thermal interface materials, and unfavorable large-scale production, so as to improve the tensile properties. , the effect of improving the free path of phonon scattering and wide application prospects

Pending Publication Date: 2022-05-13
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of complex preparation of intrinsic thermally conductive liquid crystal polymer thermal interface materials, which are not conducive to large-scale production and poor flexibility, the present invention proposes an intrinsically highly flexible, high thermally conductive liquid crystal elastomer material and its preparation and application

Method used

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  • Intrinsic high-flexibility and high-thermal-conductivity liquid crystal elastomer material as well as preparation and application thereof
  • Intrinsic high-flexibility and high-thermal-conductivity liquid crystal elastomer material as well as preparation and application thereof
  • Intrinsic high-flexibility and high-thermal-conductivity liquid crystal elastomer material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]With 6.72g (10mmol) acrylate liquid crystal monomer, 0.97g (9mmol) chain extender, 0.1g (0.1mmol) mercaptan Michael addition basic catalyst, 0.026g (0.01mmol) photoinitiator, dissolve in 10mL di In methyl chloride, after being completely dissolved, stir at room temperature for 24 hours. After the reaction, dichloromethane is evaporated, dried in vacuum for 1-2 days, the mixture is placed on a centrifugal membrane and heated at 120°C, then cooled to 100°C to form an ordered liquid crystal phase , placed on a calender at 100°C, uniaxially stretched and oriented, 365nm ultraviolet light crosslinked for 2 minutes, and the film was taken out to obtain an oriented liquid crystal elastomer. The thermal conductivity in the orientation direction of the film is 1.2 W / m·K, the longitudinal thermal conductivity is 0.5 W / m·K, and the elongation at break is 600%.

Embodiment 2

[0049] 2.66g (5mmol) acrylate liquid crystal monomer, 1.52g (4mmol) chain extender, 0.1g (0.1mmol) mercaptan Michael addition basic catalyst, 0.026g (0.01mmol) photoinitiator, dissolved in 10mL di In methyl chloride, stir at room temperature for 24 hours after complete dissolution, evaporate dichloromethane after the reaction, dry in vacuum for 1-2 days, place the mixture on a centrifugal membrane and heat at 100°C, then cool down to 80°C to form an ordered liquid crystal phase , placed on a calender at 80°C, uniaxially stretched and oriented, and crosslinked by 365nm ultraviolet light for 2 minutes, and the film was taken out to obtain an oriented liquid crystal elastomer. The thermal conductivity in the orientation direction of the film is 1.0 W / m·K, the longitudinal thermal conductivity is 0.6 W / m·K, and the elongation at break is 500%.

Embodiment 3

[0051] Dissolve 6.72g (10mmol) of acrylate liquid crystal monomer and 0.026g (0.01mmol) of photoinitiator in 10mL of dichloromethane, stir at room temperature for 24 hours after complete dissolution, evaporate dichloromethane after the reaction, and dry in vacuo After 1 to 2 days, place the mixture on a centrifugal membrane and heat it at 120°C, then cool down to 100°C to form an ordered liquid crystal phase, place it on a calender at 100°C, stretch it uniaxially, and then cross-link it with 365nm ultraviolet light for 2 minutes, then take out the film That is, an aligned liquid crystal elastomer was obtained. The thermal conductivity in the orientation direction of the film is 1.7 W / m·K, the longitudinal thermal conductivity is 0.3 W / m·K, and the elongation at break is 40%.

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Abstract

The invention discloses an intrinsic liquid crystal elastomer material with high flexibility and high thermal conductivity, which has a structural formula as shown in a formula I. In the formula I, o is equal to 0-10, p is equal to 1-10, q is equal to 1-10, and n is greater than or equal to 1; r is selected from one of H, Cl, Br, F, CH3, OCH3 and COOCH3. The preparation method comprises the following steps: firstly, preparing an acrylate-terminated prepolymer through Michael addition of an acrylate liquid crystal monomer and mercaptan, further performing calendering orientation photocuring to keep liquid crystal orientation to form an ordered structure, improving a phonon scattering free path, and preparing the intrinsic heat-conducting liquid crystal polymer thermal interface material with high heat conductivity (0.5-1.6 W/mK) and high elongation at break (greater than or equal to 100%) in the orientation direction. The problems that an existing intrinsic heat-conducting liquid crystal polymer thermal interface material is complex in preparation, not beneficial to large-scale production and poor in flexibility are solved, and the intrinsic heat-conducting liquid crystal polymer thermal interface material has wide application prospects as a thermal interface material.

Description

technical field [0001] The invention belongs to the technical field of high thermal conductivity polymer materials, and in particular relates to an intrinsic high flexibility and high thermal conductivity liquid crystal elastomer material and its preparation and application. Background technique [0002] With the development of large-size and high-power chips, heat accumulation seriously affects their working stability and service life. The key issue is to develop thermal interface materials with high thermal conductivity in the direction of heat conduction. Polymers have the advantages of light weight, easy processing, good mechanical properties, low electrical conductivity, and low cost. They are one of the main categories of widely used thermal management materials. However, compared with traditional metal or ceramic materials, polymers The random winding of molecular chains, low crystallinity, and the scattering of phonons by the vibration of molecular chains lead to low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/045C08F122/20C09K19/38
CPCC08G75/045C08F122/1006C09K19/3804
Inventor 文志斌任琳琳曾小亮庞云嵩艾代峰许永伦孙蓉
Owner SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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