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先用乙烯基三甲氧基硅烷(A-171)和二甲肼改性并还原氧化石墨烯(GO),制备A-171功能化的石墨烯(FG).研究结果表明A-171与GO上的羟基发生了反应,以共价键连接到了石墨烯的表面;FG能在四氢呋喃中均匀分散并且剥离成厚度约为0.9 nm的单一片层,其干燥后表面呈褶皱状.然后将FG与双组分硅树脂用溶液共混法制备了FG/硅树脂纳米复合材料.运用X射线衍射、扫描电子显微镜、动态热机械分析、拉伸试验等手段分析了复合材料的形态与性能,结果表明,与未处理过的石墨烯相比,FG在复合材料中有更好的分散和更强的界面作用.含0.5 wt%FG的复合材料的拉伸强度较硅树脂提高了87.7%,玻璃化温度提高了23.9℃,失重5%时的温度也提高了20.1℃.
A-171 functionalized graphene (FG) was prepared by modifying and reducing graphene oxide (GO) with vinyltrimethoxysilane (A-171) and dimethylhydrazine.The results show that A-171 and GO Of the hydroxyl groups are covalently bonded to the surface of the graphene; FG can be uniformly dispersed in tetrahydrofuran and stripped into a single sheet with a thickness of about 0.9 nm, the surface of which is wrinkled after drying, and then FG and bis The composition of the silicone resin was prepared by solution blending FG / silicone nanocomposites.The morphology and properties of the composites were analyzed by X-ray diffraction, scanning electron microscopy, dynamic thermo-mechanical analysis and tensile test, Compared with untreated graphene, FG has better dispersion and stronger interfacial effect in the composites.The tensile strength of composites containing 0.5 wt% FG is 87.7% higher than that of silicone, the glass transition temperature Increased by 23.9 ° C, the temperature at 5% weight loss also increased by 20.1 ° C.