不同填料对丁苯橡胶硫化胶应力软化效应的影响

Effect of Different Fillers on Stress Softening Effect of SBR Vulcanizates

研究炭黑、白炭黑和白炭黑/硅烷偶联剂TESPT填充丁苯橡胶硫化胶的应力软化效应,并通过扫描电子显微镜表征填料在胶料中的分散程度,探讨填料-填料相互作用、橡胶-填料相互作用、循环加载拉伸及恢复条件等因素对硫化胶应力软化效应的影响。结果表明:炭黑填充硫化胶的应力软化效应最强,白炭黑填充硫化胶的应力软化效应最弱,加入硅烷偶联剂TESPT后白炭黑填充硫化胶的应力软化效应增强;白炭黑填充硫化胶的应变能恢复程度最高,炭黑填充硫化胶次之,白炭黑/硅烷偶联剂TESPT填充硫化胶最低。

The stress softening effect for the styrene butadiene rubber(SBR)vulcanizates filled by different fillers,specifically,carbon black,silica and silica/silane coupling agent TESPT,was investigated,the dispersion of the fillers in the rubber compounds was characterized by scanning electron microscope,and the influence of filler-filler interaction,rubber-filler interaction,cyclic tension and recovery conditions after the deformation on the stress softening effect of the vulcanizates was also discussed.The results showed that the stress softening effect of the carbon black filled vulcanizate was the strongest,the stress softening effect of the silica filled vulcanizate was the weakest,and the stress softening effect of the silica filled vulcanizate increased after adding the silane coupling agent TESPT.The strain energy recovery of the silica filled vulcanizate was the highest,followed by the carbon black filled vulcanizate,and the silica/silane coupling agent TESPT filled vulcanizate had the lowest strain energy recovery.