PA基导热绝缘复合材料的制备及性能研究  

Study on preparation and properties of thermally conductive and insulating PA composites

作　　者：程亚非[1,2] 杨文彬[1,2] 魏霞[1,2] 范敬辉[3] 张凯[3] 董发勤[1] 

机构地区：[1]西南科技大学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,四川绵阳621010 [2]西南科技大学材料科学与工程学院,四川绵阳621010 [3]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《功能材料》2013年第5期748-751,共4页Journal of Functional Materials

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资助项目(11176025);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开放基金资助项目(11zxfk01;12zxfk05)

摘　　要：以PA6为基体,鳞片石墨、碳化硅晶须、Al2O3颗粒三元复配填料为导热填料,经双螺杆挤出机熔融共混,模压成型制得导热绝缘复合材料。用扫描电子显微镜(SEM)、导热分析仪、超高电阻微电流测试仪和热重分析仪(TGA)对复合材料的微观形貌、导热性能、绝缘性能和热稳定性能进行了表征。结果表明,导热填料均匀分散在聚合物基体中,形成导热网络。随着三元复配填料用量的增加,复合材料热导率升高,表面电阻率和体积电阻率下降,起始分解温度逐渐上升。填料用量为50%(质量分数)时,复合材料的热导率、体积电阻率、起始分解温度分别为1.407W/(m.K)、1.03×1011Ω.cm、344℃。A kind of thermally conductive and electrically insulating composites were obtained from mixture of flake graphite, silicon carbide whiskers, alumina particles and polycaprolactam （PA6） by melt blending using a twin-screw extruder, and then samples were prepared by compression molding. Morphology, thermally conduc- tive property, insulating property and thermal stability of composites were characterized by scanning electron microscopy （SEM）, thermal conductivity analysis instrument, high resistance micro-current tester and thermal gravimetric analysis （TG）. The results indicated that the ternary fillers were dispersed homogeneously and formed thermally conductive networks in polymeric matrix. With the increasing of the hybrid fillers content, the thermal conductivity and the initial decomposition temperature of composites were increased gradually, but the surface resistivity and the volume resistivity were declined. When the filler content was up to 50wt%, the thermal conductivity, the volume resistivity and the initial decomposition temperature were up to 1.407W/（m·K）、1.03×1011Ω·cm cm and 344344℃ respectively.

关 键 词：导热绝缘 复合材料 制备 性能 

分 类 号：TQ324.8[化学工程—合成树脂塑料工业]