科琴黑和气相生长碳纤维对石墨烯微片/聚丙烯复合材料性能的影响

Effects of Ketjen Black and Vapor-grown Carbon Fiber on the Property of Graphene Nanoplatelet/Polypropylene Composites

本文通过熔融共混法制备了多种聚丙烯(PP)基复合材料,研究了添加不同含量石墨烯微片(GNP)的GNP/PP复合材料的导热和导电性能以及科琴黑(KB)和气相生长碳纤维(VGCF)对GNP/PP复合材料导热和导电性能的影响。结果表明,随着GNP含量的增加,GNP/PP复合材料的导热系数不断增加,当GNP含量为60%时,GNP/PP复合材料的导热系数比纯PP(0.096 W/m·K)提高了12倍多;当在GNP含量为10%的GNP/PP复合材料中添加KB或VGCF后,该复合材料的导热和导电性能明显提高;扫描电镜照片表明KB或VGCF分布在GNP团聚体之间的PP基体中,GNP团聚体通过KB或VGCF链接形成通路,使得PP基体中形成了更多和更为完善的导电导热网络。

Melting-blend method was used to prepare the polypropylene （PP） based composites. Thermal and electrical conductivity of graphene nanoplatelet （GNP）/PP composite as well as the influence of Ketjen black （KB） and vapor-grown carbon fiber （VGCF） on GNP/PP composite were investigated. The results show that the thermal conductivity of GNP/PP composites increases with the increase of GNP content. The thermal conductivity of 60% GNP/PP composite increases more than 12 times than that of pure PP （0. 096W/m-K）. With the addition of KB or VGCF, both thermal and electrical conductivity of 10 % GNP/PP composite are remarkably enhanced. The SEM images demonstrate that KB and VGCF are distributed between the GNP aggregates as bridges to connect the GNP aggregates, and more conductive networks are formed in PP matrix as a result.