中文摘要：

用十六烷基三甲基溴化铵（CTAB）做有机化处理剂,通过原位插层聚合法制备了甲基苯基硅树脂/有机蒙脱土（OMMT）纳米复合材料.采用X射线衍射仪（XRD）、扫描电镜（SEM）、透射电镜（TEM）等手段研究了复合材料内部结构,同时测试了复合材料力学性能、耐高温性能及气液阻隔性能.研究结果表明：硅树脂的分子链插层进入了OMMT层间,完全破坏其重复片层结构,形成剥离型纳米复合材料;OMMT质量分数为8%时,复合材料在750℃下仅失重25%,且具有较好的气液阻隔性能;OMMT质量分数为6%时,复合材料拉伸强度为6.264 MPa,是纯硅树脂的5倍;OM-MT质量分数为4%时,压缩强度11.503 MPa,是纯硅树脂的4倍.

英文摘要：

By using cetyltrimethylammonium bromide（CTAB） as organic treatment agent,phenylmethylsilicone/organic montmorillonite（OMMT） nanocomposites were prepared by in-situ intercalative polyme-rization.The internal structure and morphology of the nanocomposites were characterized by X-ray diffraction（XRD）,scaning electron microscope（SEM） and transmission electron microscope（TEM）.Mechanical properties,high temperature resistance and barrier performance for gas and water were also studied.The results show that molecules of silicone chains are inserted into the layer of montmorillonite（MMT）,and the interlayer distance of MMT is expanded effectively after polymerization of phenylmethylsilicone prepolymer and methyl methacrylate,even forming exfoliated nanocomposites.The silicone/OMMT nanocomposite which contains 8% OMMT has better high temperature resistance and barrier properties with low thermal weight loss of 25% at 750 ℃.The nanocomposite,containing 6% OMMT,has better mechanical performance with tension strength of 6.264 MPa,which is 5 times more than that of pure silicone.When the nanocomposite contains 4% OMMT,the compression strength is 11.503 MPa,which is 4 times bigger than that of pure silicone.