【摘要】 采用双(三乙氧基丙基硅烷)四硫化物(TESPT)、双(三乙氧基丙基硅烷)二硫化物(TESPD)和3-丙酰基硫代-1-丙基-三甲氧基硅烷(PXT)制备了天然橡胶/白炭黑复合材料。用扫描电镜(SEM)表征了白炭黑在橡胶中的分布形态。SEM表明,与TESPT和TESPD相比,PXT改性白炭黑在橡胶中分散最好,分布最均匀。力学测试表明,含TESPT的复合材料其定伸应力最大,而含PXT的拉伸与撕裂强度最大。利用橡胶加工分析仪对天然橡胶/白炭黑复合材料的动态力学性能分析表明,三种偶联剂改善了白炭黑的表面特性,大大减轻填料网络化,使储能模量、损耗模量和损耗因子减小,其中PXT的改性综合效果最好。更多还原

【Abstract】 Natural rubber(NR)/silica composites were prepared with bis-(3-triethoxysilylpropyl)tetrasulfane(TESPT),bis-(3-triethoxysilylpropyl)disulfane(TESPD)and 3-propionylthio-1-propyltrimethoxylsilane(PXT).The investigation results of structure and properties of composites show that compared with TESPD and TESPT,PXT modified silica is harder to aggregate and gets more even separation and distribution in matrix.The tensile modulus and hardness of composite with TESPT is higher than others,however the tensile and tear strength of composite having PXT is higher.Three kinds of sulfur-containing silane coupling agent improve the surface characteristic of silica,interact with rubber chain and lessen filler networking leading to the reduction of G’,G″and tanδ.The comprehensive modification effect of PXT is best of all.更多还原