Abstract: Ethylene-propylene diene monomer rubber-g-γ-methacryloxypropyltrimethoxysilane (EPDM-g-KH570)/SiO₂ nanocomposites were prepared with the in-situ sol-gel method.Firstly, the EPDM-g-KH570 was prepared by co-irradiation.Then the graft product was soaked into tetraethylorthosilicate (TEOS).Finally, the swollen material was put into butylamine solution to catalyze the sol-gel reaction of the precursor TEOS.The influences of different solvents and concentrations of butylamine on sol-gel reaction of TEOS and the particle size of the silica obtained were studied.The morphology and microstructures of EPDM-g-KH570/SiO₂ hybrid were characterized by FT-IR and SEM.The results showed that the swelling of TEOS and the equilibrium conversion of TEOS were improved significantly by grafted KH570. Compared to the ungrafted EPDM, SiO₂ average diameters were smaller and had a good dispersion in the grafted EPDM.

Key words: ethylene-propylene diene monomer rubber, nano-silica, sol-gel, nanohybrid

摘要： 采用原位溶胶-凝胶反应制备乙丙橡胶/ SiO₂纳米复合材料。分别以乙丙橡胶（EPDM）和γ-甲基丙烯酰氧丙基三甲氧基硅烷（KH570）接枝改性的乙丙橡胶 （EPDM-g-KH570）在前驱体四乙氧基硅烷 （TEOS）中溶胀，再浸入含有正丁胺的催化剂溶液中催化前驱体的原位溶胶-凝胶反应。考察了不同溶剂以及催化剂含量对TEOS转化率和原位生成的SiO₂粒径的影响。采用FT-IR、SEM等测试手段对纳米复合材料进行了表征。结果表明，接枝KH570后，TEOS转化率明显提高，SiO₂粒径明显减小，在材料中的分散性很好。

关键词: 乙丙橡胶, 纳米SiO₂, 溶胶-凝胶, 纳米杂化