导热绝缘h-BN/MVQ/EVA复合材料的双逾渗效应（英文）  

Double Percolation Effect in Thermally Conductive and Electrically Insulating h-BN/MVQ/EVA Ternary Composite

作　　者：杨文彬[1,2] 张凯[3] 廖治强[1] 程金旭 谢长琼[1] 吴菊英[3] 范敬辉[3] 

机构地区：[1]西南科技大学材料科学与工程学院,四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,绵阳621010 [2]四川大学高分子材料工程国家重点实验室,成都610065 [3]中国工程物理研究院总体工程研究所,绵阳621010

出　　处：《材料导报》2017年第7期137-142,共6页Materials Reports

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金(U1530102);四川省科技厅应用基础研究项目(2017JY0149);高分子材料工程国家重点实验室开放课题(sklpme2016-4-33);核废物与环境安全国防重点学科实验室开放基金(15kffk08)

摘　　要：将h-BN加入到MVQ和EVA混合物中制备导热绝缘h-BN/MVQ/EVA复合材料,SEM结果表明h-BN选择性分布在EVA,与杨氏方程理论一致。h-BN/MVQ/EVA复合材料中的双逾渗效应,有助于力学性能和导热性能的提升。h-BN/MVQ/EVA复合材料的热导率与h-BN含量和MVQ/EVA比值有关。当EVA质量分数为30%时,h-BN/MVQ/EVA复合材料热导率的相对值最大。h-BN/MVQ/EVA复合材料的拉伸强度和断裂伸长率与EVA含量有关,随着EVA和h-BN含量的增加,复合材料的介电常数降低。Hexagonal boron nitride （h-BN） was added into polymer blends of methyl-vinyl-silicone rubber （MVQ） and ethy- lene-vinyl-acetate copolymer （EVA） to prepare thermally conductive and electrically insulating composites by melt processing me- thod. According to Young＇s equation, the wettability coefficient points out that the dispersion of h-BN in EVA is thermodynamically more favorable than in MVQ. The result of SEM showed that h-BN was selectively located in EVA. There existed double percolation effect in h-BN/MVQ/EVA ternary composites, which resulted in promoting for both mechanical properties and thermal conductivity. The thermal conductivity of h-BN/MVQ/EVA composites were related with h-BN content and EVA/MVQ ratio. When EVA con- tent was 30 wt% in the matrix blend, the relatively increased rate of thermal conductivity of h-BN/MVQ/EVA composites was the highest. The tensile strength and the elongation at break were mainly related with the EVA content in polymer matrix. The increa- sing amount of EVA and h-BN in the composites resulted in a decrease in dielectric constant.

关 键 词：热导率 双逾渗 介电常数 六方氮化硼/MVQ/EVA 绝缘 

分 类 号：TB33[一般工业技术—材料科学与工程]