Fabrication of highly anisotropic graphene nanoplatelets/silicone rubber composites and their thermal conductivity

摘要

A graphene nanoplatelets/silicone rubber composite with high anisotropy was prepared under a direct-current electric field. Multi-layered graphene nanoplatelets with 20-40 layers were directly added into the RTV silicone system with different contents. The direct current electric field was generated by two copper parallel plates with different electric strengths of 1 ~ 5 kV/cm. The alignment of graphene nanoplatelets in silicone rubber was observed by optical microscopy and the anisotropic index of the composites was characterized by thermal conductivity measurements at different directions. The effects of graphene contents and electric strength on the anisotropic index of graphene nanoplatelets/silicone rubber composites were discussed.