鳞片石墨取向对鳞片石墨/聚丙烯、鳞片石墨/尼龙66复合材料导热性能的影响

复合材料学报, 2014, 31(3): 610-616.

鳞片石墨取向对鳞片石墨/聚丙烯、鳞片石墨/尼龙66复合材料导热性能的影响

刘科 ^1, , 刘颖 ^2, , 吴大鸣 ^3, , 庄俭 ^4, , 许红 ^5, , 唐胜德 ^6,

1.北京化工大学高分子材料加工装备教育部工程研究中心,北京,100029

2.北京化工大学高分子材料加工装备教育部工程研究中心,北京,100029

3.北京化工大学有机无机复合材料国家重点实验室,北京,100029

4.北京化工大学高分子材料加工装备教育部工程研究中心,北京,100029

5.北京化工大学高分子材料加工装备教育部工程研究中心,北京,100029

6.北京化工大学高分子材料加工装备教育部工程研究中心,北京,100029

基金项目: 国家自然科学基金(51203010) 高等学校博士学科点专项科研基金(2012001020006)

关键词：鳞片石墨 , 取向 , 聚丙烯 , 尼龙66 , 热导率 , 复合材料

Effect of flake graphite orientation on thermal conductivity of flake graphite/polypropylene, flake graphite/nylon66 composites

Keywords： flake graphite , orientation , polypropylene , nylon66 , thermal conductivity , composites

为了研究鳞片石墨在基体中的取向对复合材料导热性能特别是不同方向导热性能的影响,通过双螺杆挤出混合及注射成型制备了鳞片石墨/聚丙烯(PP)、鳞片石墨/尼龙66(PA66)导热复合材料,并利用扫描电子显微镜和超声波测试对制备的样品进行了分析.结果表明:鳞片石墨的粒径越小,平面取向度越高,平面与垂直方向的热导率差值越大.加工中双螺杆挤出机的过度剪切会破坏鳞片石墨的片层结构,影响鳞片石墨导热网络的形成,降低复合材料的热导率,但提高了材料导热的各向均匀性.适度的剪切可以打开鳞片石墨的片层结构,提高复合材料的热导率,注射成型更多影响到制品导热的各向异性.

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