【摘要】 将氧化石墨烯和乙烯基三乙氧硅烷（TEVS）混合液进行γ射线辐照处理,制备聚硅氧烷功能化的改性氧化石墨烯（GO-Si）,并通过红外光谱（FT-IR）、拉曼光谱（Raman）表征分析GO-Si的结构。在辐照时,随着吸收剂量增加,聚硅氧烷的接枝量也随之增加;由于TEVS的接枝聚合,GO-Si表面的聚硅氧烷含量明显提高。将GO-Si和羟基硅油共混,制备室温固化的硅橡胶/改性氧化石墨烯复合材料（SR/GO-Si）,与未改性氧化石墨烯（GO）相比,GO-Si与硅橡胶基体相容性更好,分散更加均匀。对SR/GO-Si和纯SR的力学性能、导热性能和辐照效应进行对比分析,结果表明,GO-Si的引入可以明显提高复合材料的综合性能,导热系数从0.13 W·m^-1·K^-1提高至1.1 W·m^-1·K^-1,拉伸强度提高了149%。在90 kGy辐照条件下,GO-Si的引入对复合材料的辐照效应起到积极作用,提高了拉伸强度和硬度,SR/GO-Si有望在低剂量辐射环境下作为电子封装热界面材料使用。更多还原

【Abstract】 Functionalized graphene oxide（named GO-Si） was synthesized with graphene oxide and triethoxyvinylsilane（TEVS） in tetrahydrofuran solution by γ-ray irradiation. TEVS was found to be grafted successfully onto GO sheets and the polysilane content on the GO-Si was increased with the increasing absorbed dose. The structures of GO-Si were testified by Fourier Transform Infrared Spectroscopy and Raman Spectra. The resultant GO-Si was dispersed into α, ω-dihydroxypolydimethylsiloxane to prepare room temperature vulcanized silicone rubber composites（named SR/GO-Si） by solution casting. The dispersion of GO-Si was more uniform than that of GO. Compared to the pure SR, thermal conductivity of SR/GO-Si-1.95 composites was increased from 0.13 W·m^-1·K^-1 to 1.1 W·m^-1·K^-1, and its tensile strength increased 149%. Moreover, the Shore A hardness and the tensile strength of SR/GO-Si were both improved after being radiated by γ-ray with absorbed dose 90 kGy. The results proved that the SR/GO-Si with high thermal conductive ability in this study is promising application as the thermal interfacial functional material in low dose radiation enviroment.更多还原