采用表面经过硅烷偶联剂原位修饰的纳米二氧化硅增强硅橡胶.通过扫描电子显微镜和Payne效应考察了纳米二氧化硅在硅橡胶中的分散特性; 用DSC分析了复合体系的低温结晶行为; 考察了填料对硅橡胶力学性能的影响.结果表明,由于修饰后纳米颗粒表面非极性有机基团的存在和表面能的降低,无须加入分散剂,纳米颗粒就能在硅橡胶中有较好的分散; 在各自最优添加量时,DNS-3链状纳米二氧化硅增强的硅橡胶相对于气相法二氧化硅增强的硅橡胶在拉伸强度、撕裂强度及断裂伸长率上有显著提高; DNS-2纳米二氧化硅增强性能与气相法二氧化硅的相当,但前者混炼胶黏度较小,有较好的加工性.
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