混合溶剂分散法制备耐高温、高导热六方氮化硼/半芳香聚酰胺12T复合材料及其性能  

Preparation and properties of hexagonal boron nitride/semi-aromatic polyamide 12T composites with high-temperature resistance and high thermal conductivity prepared by mixed solvent dispersion method

作　　者：陈晓杰 马舸 孟慧迪 崔喆[1] 付鹏[1] 赵蔚 庞新厂[1] 赵清香[1] 刘民英[1] 张晓朦 CHEN Xiaojie;MA Ge;MENG Huidi;CUI Zhe;FU Peng;ZHAO Wei;PANG Xinchang;ZHAO Qingxiang;LIU Minying;ZHANG Xiaomeng(Henan Key Laboratory of Advanced Nylon Materials and Application,Engineering Laboratory of High-Performance Nylon Engineering Plastics of China Petroleum and Chemical Industry,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;Jinguan Electric CO.,LTD.,Nanyang 473000,China)

机构地区：[1]郑州大学材料科学与工程学院,河南省先进尼龙材料及应用重点实验室,中国石油和化工行业高性能尼龙工程塑料工程实验室,郑州450001 [2]四川大学高分子材料工程国家重点实验室,成都610065 [3]金冠电气股份有限公司,南阳473000

出　　处：《复合材料学报》2023年第2期825-835,共11页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划(2017YFB0307600);中国博士后科学基金(2020M682317);河南省博士后基金(202002018);高分子材料工程国家重点实验室开放课题(sklpme2021-05-10);河南省高等学校重点科研项目(22A430037)。

摘　　要：制备兼具优异耐高温性能和导热性能的聚合物基复合材料对于电子元器件的封装保护、高效散热和稳定成型至关重要。本文通过混合溶剂分散法(MSD)制备了六方氮化硼(BN)/半芳香聚酰胺12T(PA12T)复合材料,并对复合材料的微观结构、导热、耐高温、介电和力学性能进行了表征。结果表明:混合溶剂分散法可以有效实现BN和PA12T粉末的均匀悬浮,并可协同真空辅助自组装法与真空热压法构筑具有均一分散和取向结构的复合材料。研究表明,当BN/PA12T复合材料中的BN含量为40wt%时,混合溶剂分散法制备的样品的平面导热率可以达到2.73 W/(m·K),是机械混合法(MM)制备的样品(1.59 W/(m·K))的1.72倍,同时其具有优异的力学性能、低介电常数(3.6)、介电损耗(0.016)和显著的耐高温性能(维卡软化点超过250℃且初始分解温度可达446℃)。综上所述,混合溶剂分散法制备的BN/PA12T复合材料在电子封装及热管理领域中具有广阔的应用前景。Fabrication of the polymer-based composites with excellent high temperature resistance and thermal conductivity is very important for the packaging protection,efficient heat dissipation and processing of electronic components.In this work,high temperature resistant and thermally conductive hexagonal boron nitride(BN)/semiaromatic polyamide 12T(PA12T)composites with uniform dispersion and orientation filler structure were prepared by mixed solvent dispersion(MSD)method,and the microstructure,thermal conductivity,high-temperature resistance,dielectric and mechanical properties of the composites were systematically characterized.The results show that the BN powder and PA12T powder can be suspended uniformly in the mixed solvent.Next,combining the vacuum-assisted self-assembly technique and vacuum hot compression method,the composites with uniformly dispersed and oriented BN structure are fabricated successfully.When the content of BN is 40wt%in BN/PA12T composite,the in-plane thermal conductivity of the composite prepared by the MSD method is 2.73 W/(m·K),which is 1.72 times that of the composite(1.59 W/(m·K))prepared by the mechanical mixing(MM)method.Furthermore,the composite prepared by the MSD method also possesses excellent mechanical properties,low dielectric permittivity of 3.6 and dielectric loss of 0.016,outstanding high-temperature resistance with the initial decomposition temperature of 446℃and Vicat softening temperature of more than 250℃.Therefore,the BN/PA12T composite prepared by the MSD method will have a wide range of applications in the fields of electronic packaging and thermal management.

关 键 词：聚酰胺 混合溶剂分散法 耐高温性能 导热复合材料 六方氮化硼 

分 类 号：TB332[一般工业技术—材料科学与工程]