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A thermally conductive filler grafted polyarylether-polyimide composite material and its preparation method

A technology of thermally conductive filler and polyimide, which is applied in the field of thermally conductive filler grafted polyarylene ether-polyimide composite material and its preparation, can solve the problems of low thermal conductivity, increased interface, unfavorable thermal conductivity and the like

Active Publication Date: 2021-03-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the presence of additives in this method increases the number of interfaces, thereby increasing the thermal resistance of the interface, which is not conducive to the improvement of thermal conductivity.
[0004] Therefore, the thermal conductivity of existing polymers is low, and the addition of thermally conductive fillers, especially nano-fillers with small sizes, will increase the interface between the polymer and the thermally conductive filler, which will lead to an increase in the thermal resistance of the interface, and the ideal thermal conductivity cannot be obtained. As a result, it is often necessary to add a large amount of thermally conductive filler (loading amount greater than 20%) to achieve ideal thermal conductivity, but at the same time the mechanical properties of the composite material drop sharply, which limits its application

Method used

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  • A thermally conductive filler grafted polyarylether-polyimide composite material and its preparation method
  • A thermally conductive filler grafted polyarylether-polyimide composite material and its preparation method
  • A thermally conductive filler grafted polyarylether-polyimide composite material and its preparation method

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preparation example Construction

[0032] The invention provides a method for preparing a thermally conductive filler grafted polyarylether-polyimide composite material, comprising the following steps:

[0033] Mix the thermally conductive filler and the alkaline solution, and perform a hydrothermal reaction to obtain a hydroxylated thermally conductive filler;

[0034] Mix the hydroxylated thermally conductive filler, dihalogenated monomer, diphenolic monomer, catalyst, reaction solvent, and water-carrying agent, and carry out water-carrying and copolymerization reactions in sequence to obtain thermally conductive filler-grafted polyarylether; the dihalogenated monomer The body contains aromatic groups;

[0035] Dispersing the thermally conductive filler grafted polyarylether in a dispersant to obtain a dispersion;

[0036] After the dispersion liquid is coated on the surface of the polyimide fabric, the phase transformation is carried out in water, and the obtained composite is subjected to hot pressing to o...

Embodiment 1

[0056] (1) Weigh 50g of boron nitride, disperse it in 80mL of 6mol / L sodium hydroxide aqueous solution, then transfer the resulting solution into a stainless steel reaction kettle, tighten the reaction kettle to make it airtight, and then put the reaction The kettle was placed in an oven, and kept at 200°C for 15 minutes for hydrothermal reaction. After the reaction was completed, the reactor was taken out, cooled to room temperature, and the resulting mixture was washed several times until the filtrate was neutral. After drying, hydroxylated boron nitride was obtained. ;

[0057](2) Add 21.82g (0.1mol) of 4,4'-difluorobenzophenone, 31.39g (0.098mol) of 3 to a three-necked flask with nitrogen inlet, water separator, thermometer and magnetic stirrer, 3-bis(4-hydroxyphenyl)-3H-isobenzofuranone, 27.64g (0.2mol) anhydrous potassium carbonate, 532.12g dimethyl sulfoxide (with 4,4'-difluorobenzophenone and 3,3-bis(4-hydroxyphenyl)-3H-isobenzofuranone and the total mass ratio of hyd...

Embodiment 2

[0062] (1) Weigh 50g of aluminum nitride, disperse it in 100mL of 1mol / L sodium hydroxide aqueous solution, then transfer the resulting solution into a stainless steel reaction kettle, tighten the reaction kettle to make it airtight, and then put the reaction The kettle was placed in an oven, and kept at 150°C for 30 minutes for hydrothermal reaction. After the reaction was completed, the reactor was taken out, cooled to room temperature, and the resulting mixture was washed several times until the filtrate was neutral. After drying, hydroxylated aluminum nitride was obtained. ;

[0063] (2) Add 32.23g (0.1mol) 1,3-bis(4-fluorobenzoyl)benzene, 22.6g (0.099mol ) 2,2-bis(4-hydroxyphenyl)propane, 23.32g (0.22mol) anhydrous sodium carbonate, 388.39g N-methylpyrrolidone (with 1,3-bis(4-fluorobenzoyl)benzene and The mass ratio of the total mass of 2,2'-bis(4-hydroxyphenyl)propane and the hydroxylated aluminum nitride is 85:15), 40mL toluene and 13.71g hydroxylated aluminum nitride ...

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Abstract

The invention provides a heat-conducting filler grafted polyarylether-polyimide composite material and a preparation method thereof, and belongs to the technical field of heat-conducting materials. According to the invention, a heat-conducting filler is hydroxylated through a hydrothermal reaction, the hydroxylated heat-conducting filler participates in the polymerization reaction of polyaryletherto form a covalent bond between the hydroxylated heat-conducting filler and a polymer matrix, thereby providing a medium for phonon transmission, lowering the interface thermal resistance between theheat-conducting filler and the polyarylether polymer and enhancing the heat conductivity coefficient of the composite material. Meanwhile, a polyimide fabric is used as a mechanical support network,so that the mechanical properties of the material is enhanced, and the application field of the composite material is further expanded. Results of the embodiment indicate that the heat conductivity coefficient of the prepared heat-conducting filler grafted polyarylether-polyimide composite material can reach 1.53W / mK, the tensile strength can reach 54MPa, the tensile modulus can reach 2.6GPa, andthe elongation at break can reach 8.1%.

Description

technical field [0001] The invention relates to the technical field of thermally conductive materials, in particular to a thermally conductive filler grafted polyarylether-polyimide composite material and a preparation method thereof. Background technique [0002] Thermally conductive materials have been widely used in various fields of national defense industry and national economy, and have become indispensable functional materials in modern industry and life. With the development of science and technology, the rapid development of microelectronics integration and assembly technology, the volume of electronic components and logic circuits has been shrinking, while the operating frequency has increased sharply, which leads to a large amount of heat accumulation, which affects the normal use of devices. Therefore, whether timely and rapid heat dissipation becomes a key factor determining the life of the device, and it is urgent to develop materials with higher thermal conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L87/00C08L79/08C08G83/00C09K5/14
CPCC08G83/001C08L87/005C08L2205/16C09K5/14C08L79/08
Inventor 王大明丛冰赵君禹王春博周宏伟赵晓刚陈春海
Owner JILIN UNIV