碳纳米管/三元乙丙橡胶复合材料导热性能的研究

Study of Thermal Conductivity of Carbon Nanotube/EPDM Rubber Composite Materials

本文将不同质量和不同管径的碳纳米管填加到三元乙丙橡胶中,观察碳纳米管在橡胶基体中的分散情况,测试碳纳米管/三元乙丙橡胶复合材料热导率的变化,并进行了理论分析。结果表明:碳纳米管与橡胶基体间发生了界面结合作用,其在橡胶基体中分散不均并且取向各异;碳纳米管/三元乙丙橡胶复合材料的热导率随着碳纳米管填充量的增加整体呈上升趋势;低填充量下,大管径的填料比小管径的填料更容易形成导热链,当填料的填充量超过一定值时,即20g时,小管径填料与橡胶基体之间的连接更加稳定,橡胶与填料界面的热阻更低,复合材料的热导率更高。

In this article,EPDM is filled with carbon nanotubes with different content and diameter. The dispersion of carbon nanotubes in rubber matrix is investigated.The changes in thermal conductivity of carbon nanotubes/EPDM composites is tested and corresponding theoretical analysis are discussed.Results show that there＇s an interface bonding effect between carbon nanotubes and rubber matrix,carbon nanotubes are not well dispersed in matrix and have different orientations. With the increase of carbon nanotubes,thermal conductivity of carbon nanotubes/EPDM composite shows upward trend.In low-filler content,large diameter filler is easier to form thermal conductivity chain than small one.When filler content exceeds a certain value,that is 20 g,small diameter filler and rubber matrix will shows more stable connection,lower thermal resistance and higher thermal conductivity.