石墨烯微片碳纳米管hdpe导热复合材料的制备及性能研究材料工程专业论文.docxVIP

广东工业大学硕士学位论文28．6wt％SiC对复合材料有异相成核的作用，提高了结晶速率，随着SiC含量进一步 广东工业大学硕士学位论文 28．6wt％SiC对复合材料有异相成核的作用，提高了结晶速率，随着SiC含量进一步 增加，复合材料半结晶时间延长。填料粒子之间的网络结构很强，体系出现了一定 的相分离现象，SiC含量为50wt％时，复合材料的冲击强度和拉伸强度分别降低64．1％ 和38．4％。 关键词：石墨烯微片；碳纳米管；高密度聚乙烯；导热 II 万方数据 ABSTRACTABSTRACT ABSTRACT ABSTRACT With the rapid development of microelectronic package and integration technology in recent years，the miniaturization of electronic components is accelerated greatly with high performance and efficiency．The low heat dissipation speed in small electronic components will shorten the service life of equipment．Polymer materials show wide application in many fields except thermal devices because of their low thermal conductivity．How to prepare the hi曲thermal conductive polymer composites with excellent properties has attracted many concerns．In this paper,high—density polyethylene(HDPE)Was used as a matrix filled、Ⅳith hybrid carbon materials， compound carbon materials and hybrid carbon materials／silicon carbide(SiC)， respectively,to prepare thermally conductive polymer composites．The main points were summarized as follows Firstly,we carried out carbon nanotubes(CNTs)grafting to graphene nanoplatelets (GNPs)with a silane coupling agent．The interface structure of GNPs-CNTs hybrid materials were characterized by Fourier transform infrared spectroscopy(FTIR)，X—ray photoelectron spectroscopy(xvs)，thermal gravity analysis(TGA)，scanning electron microscope(SEM)and Transmission electron microscopy(TEM)．The results showed that CNTs and GNPs were connected to silane coupling agent through the amide group and ester group．Carbon nanotubes were successfully grafted to graphene nanoplatelets Using GNPs-CNTs hybrid materials and GNPs／CNTs compound materials as thermally conductive filler,the effect of different filler systems on the properties of GNPs／CNTs／HDPE composites was investigated．The results showed that hybrid filler were well dispersed in the matrix．Compound filler were easy to be agglomerated，and the melt viscos