聚硅氧烷改性氧化石墨烯的辐射制备及其在导热硅橡胶中的应用研究

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。

Radiation Preparation of Polysilane Modified Graphene Oxide for Improving Thermal Conductivity and Mechanical Properties of Silicone Rubber

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.