氮化硼在聚乙烯/乙烯-醋酸乙烯共聚物中的选择分布及复合材料的导热性能  

Selective Distribution of Boron Nitride in Polyethylene/Ethylene-Vinyl Acetate Copolymer and the Thermal Conductive Properties

作　　者：陈金[1] 王春锋[1] 王永亮[1] 韩志东[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《高分子材料科学与工程》2015年第2期98-102,107,共6页Polymer Materials Science & Engineering

基　　金：黑龙江省留学归国人员科学基金(LC2011C15);教育部科学技术研究重点项目(212040);教育部新世纪优秀人才支持计划(NCET-12-0705)

摘　　要：采用氮化硼(BN)为导热填料、以聚乙烯(PE)和乙烯-醋酸乙烯共聚物(EVA)为基体树脂制备了导热复合材料。利用溶剂选择性萃取和扫描电子显微镜研究了PE-EVA共混物的相结构及BN在两相中的分布行为,以热导率为参数评价了复合材料的导热性能。研究结果表明,PE-EVA共混物的相结构与两者的用量比相关,在PE/EVA质量比为1/1时可获得具有共连续结构的共混物;在两相共连续PE-EVA共混物中引入BN后,发现BN选择分布在PE相中,BN/PE相与EVA形成共连续结构。BN的选择分布及共连续结构的形成有助于提高复合材料的热导率,在BN质量分数为30%时,与BN/PE相比,具有选择分布和相连续结构的BN/PE-EVA复合材料的热导率提高了15.4%。Blends of polyethylene(PE) and ethylene vinyl acetate copolymer(EVA) were applied to prepare thermally conductive composites by melt blending with boron nitride(BN). The morphological structure of PE-EVA blends and the selective distribution of BN in PE-EVA blends were investigated by selective solvent extraction and scanning electron microscopy(SEM). The thermal conductivities of BN/PE-EVA composites were evaluated. As a result,a cocontinuous blend was obtained at the PE/EVA mass ratio of 1 /1,in which BN is observed to selectively localize in PE phase. Accordingly,thermally conductive composites with the co-continuous structure of BN/PE and EVA were obtained. The selective distribution of BN and the co-continuous structure of the composites are helpful in improving the thermal conductivity,leading to a 15. 4% increase of the thermal conductivity of BN/PE-EVA composites in comparison to that of BN/PE composites.

关 键 词：氮化硼 聚乙烯 乙烯-醋酸乙烯共聚物 共连续结构 导热率 

分 类 号：O631.11[理学—高分子化学]