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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%.

参考文献

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