用粉末混合法制备了氮化硼增强高密聚乙烯塑料,研究了材料内部填料分散状态,填料含量,基体粒径和温度对热导率的影响.结果表明,材料中填料粒子围绕在聚乙烯粒子周围,形成了特殊的网状导热通路;增大填料用量和基体粒径,热导率升高;填料体积用量为30%时体系热导率达0.96 W/m·K,是基体热导率的3倍多.用Y. Agari模型分析了基体粒径对形成导热通路的影响.此外,使用氧化铝短纤维和氮化硼混杂填料能获得更高的热导率.
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