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

A liquid crystal elastomer and high flexibility technology, applied in the field of high thermal conductivity liquid crystal elastomer materials and intrinsically high flexibility, can solve the problems of poor flexibility, complex preparation of thermally conductive liquid crystal polymer thermal interface materials, and unfavorable large-scale production. Complex preparation, improved phonon scattering free path, and improved tensile properties

Pending Publication Date: 2022-05-06
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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]Dissolve 5.29g (10mmol) of double-terminal double-bond liquid crystal monomer, 0.97g (9mmol) of chain extender, and 0.026g (0.01mmol) of photoinitiator in 10mL of dichloromethane, and irradiate with 365nm ultraviolet light for 2 minutes after complete dissolution , stirred at room temperature for 1 hour, then added 0.244g (0.5mmol) cross-linking agent, 0.026g (0.01mmol) photoinitiator, evaporated dichloromethane after thorough mixing, vacuum dried for 1 day, and placed the mixture on a centrifugal membrane for heating After 120°C, the temperature was lowered to 100°C to form an ordered liquid crystal phase, placed on a calender at 100°C, uniaxially stretched and oriented, and crosslinked with 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 1.2 W / m·K, the longitudinal thermal conductivity is 0.5 W / m·K, and the elongation at break is 600%. ...

Embodiment 2

[0049] Dissolve 2.22g (5mmol) of double-terminal double-bond liquid crystal monomer, 1.52g (4mmol) of chain extender, and 0.026g (0.01mmol) of photoinitiator in 10mL of dichloromethane. , stirred at room temperature for 1 hour, then added 0.244g (0.5mmol) cross-linking agent, 0.026g (0.01mmol) photoinitiator, evaporated dichloromethane after thorough mixing, vacuum dried for 1 day, and placed the mixture on a centrifugal membrane for heating After 120°C, the temperature was lowered to 100°C to form an ordered liquid crystal phase, placed on a calender at 100°C, uniaxially stretched and oriented, and crosslinked with 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 0.4 W / m·K, and the elongation at break is 500%.

Embodiment 3

[0051] Dissolve 5.29g (10mmol) double-terminal double-bond liquid crystal monomer, 0.244g (0.5mmol) cross-linking agent, 0.026g (0.01mmol) photoinitiator in 10mL dichloromethane, and evaporate the dichloromethane after fully mixing , vacuum-dry for 1 day, 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, put it on a calender at 100°C, and cross-link with 365nm ultraviolet light for 2 minutes after uniaxial stretching and orientation, take out The thin film obtains the alignment liquid crystal elastomer. The thermal conductivity in the orientation direction of the film is 0.8 W / m·K, the longitudinal thermal conductivity is 0.3 W / m·K, and the elongation at break is 100%.

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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. A double-end double-bond liquid crystal monomer and mercaptan are subjected to a click chemical reaction to prepare a double-bond end-capped prepolymer, calendering uniaxial stretching is further carried out to keep liquid crystal orientation to form an ordered structure, the phonon scattering free path is improved, and the prepared intrinsic liquid crystal elastomer material has high thermal conductivity (0.3-1.5 W/mK) in the orientation direction and high elongation at break (greater than or equal to 100%), and can be applied to the field of liquid crystal display. 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): C08G75/045C08J5/18C08L81/02
CPCC08G75/045C08J5/18C08J2381/02
Inventor 任琳琳文志斌范剑锋莫平菁纪迎港曾小亮孙蓉
Owner SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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