液相法原位修饰纳米SiO_2对ESBR的补强作用

Comparing Effect on Properties of ESBR Filled with Surface-Modified in Situ of Nanosilica

采用原位表面修饰纳米SiO2补强乳聚丁苯橡胶(ESBR),借助修饰界面与基体作用力的差异,分析了原位表面修饰纳米SiO2对ESBR的补强机理,以及由此引起复合材料力学性能、硫化加工、动态力学性能的变化。实验表明,可反应性纳米SiO2RNS-D对ESBR力学性能具有更好的补强效果;这是因为与可分散性纳米SiO2DNS-2相比,RNS-D表面修饰的双键表现出较强的反应活性,其强劲的界面结合作用和密集的交联结构提高了RNS-D的补强作用,界面作用力的差异也深刻地影响着硫化体系的加工和动态力学性能。

The effect of interaction mechanism between siliane coupling agent and silica modified in situ on the mechanical,cure characteristics and dynamic mechanical properties was investigated.According to the testing of bound rubber and link network,the results indicate that at respective optimum content,the reactive nano-silica （RNS-D） has more bound rubber and higher link network,which induced evidently better reinforcement to emulsion styrene butadiene rubber（ESBR） in the tensile strength,tear strength and elongation at break than the dispersible nano-silica （DNS-2）,and higher modulus and lower loss factor （tanδ）of the vulcanizates obtained substantially by the incorporation of the filler in the rubber.This is due to stronger level of rubber-filler adhesion and formation of chemical bonds,the high friction is also restrained between the rubber and RNS-D.