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Influence of Filler Systems and Microstructures of SBR on Stress Softening Effect of SBR Vulcanizates  

Choi, Sung-Seen (Department of Chemistry, Sejong University)
Han, Dong-Hun (Department of Chemistry, Sejong University)
Woo, Chang-Su (Korea Institute of Machinery and Materials)
Publication Information
Elastomers and Composites / v.41, no.3, 2006 , pp. 164-171 More about this Journal
Abstract
Stress softening behaviors of SBR vulcanizates reinforced with silica or carbon black were studied. Two types of SBR with different 1,2-unit contents of 18 and 60 wt% were used and three filler systems of carbon black and silica with/without silane coupling agent were employed. Stress softening behaviors of the SBR vulcanizates were varied with the SBR types as well as the filler systems. The silica-filled rubber specimens had higher residual strains than the carbon black-filled ones. The residual strains of silica-filled vulcanizates were remarkably reduced by adding a silane coupling agent. The maximum loads at 50% maximum stretch of the carbon black-filled vulcanizates were lower than those of the silica-filled ones. On the contrary, the maximum loads at 200% maximum stretch of the carbon black-filled vulcanizates were higher than those of the silica-filled ones. The maximum loads of the specimens with the 1,2-unit content of 60 wt% are higher than those with the 1,2-unit content of 18 wt% irrespective of the filler systems.
Keywords
stress softening; SBR composite; filler system; microstructure;
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