中文摘要：

研究了偶联剂对不同粒径白炭黑（15 nm、30 nm、80 nm）/天然橡胶纳米复合材料的硫化特性、力学性能、应力软化效应、Payne效应、损耗因子、压缩生热和动态热机械性能的影响,并与未加入偶联剂的复合材料进行对比。结果表明：加入偶联剂Si69使白炭黑在橡胶中的分散性提高,增强白炭黑与橡胶基体之间的结合,提高白炭黑/NR复合材料的力学性能,降低胶料的正硫化时间;白炭黑粒径越小Si69的作用越明显,越有利于复合材料的硫化特性和力学性能的提高;添加Si69使15 nm和30 nm白炭黑复合材料的Payne效应、损耗因子和定负荷压缩生热的温升降低,但是对80 nm白炭黑复合材料的影响不大。

英文摘要：

The effect of coupling agent silane Si69 on properties of nanocomposites of nature rubber with different sized nano-silica （15, 30 and 80 nm）was investigated in terms of curing performance, mechanical properties, Mullins effect, Payne-effect, loss factor, the dynamic heat build-up and dynamic mechanical property etc. while taking the same composites without coupling agent as comparison. Results show that with the addition of the coupling agent $i69, the dispersity of nano-silica in the rubber and the binding of nano-silica with the rubber matrix were improved; the mechanical properties of nano-silica/na- ture rubber composite were effectively enhanced and the positive sulfuration time t90 was shortened. It is noted that the smaller size of the nano-silica is, the better positive effect on the performance and mechanical properties of the composite can be obtained. Due to the addition of the coupling agent Si69, the Payne-effect, loss factor and the dynamic heat build-up can be reduced for the composites with nano-silica of 15 nm and 30 nm, respectively, but is not obvious for the ones with 80 nm silica.