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Cure characteristics of non-oil-extended solution SBR (S-SBR_NO) and oil-extended solution SBR (S- SBR_EO) compounds reinforced with silica/carbon black were investigated. Minimum and maximum torques of S- SBR_EO compounds were much smaller than those of S-SBR_NO ones. Delta torques of S-SBR_NO compounds were gre- ater than those of S-SBR_EO ones, and that of S-SBR_NO compound increased with increase in the 1,2-unit content. Opti- mum cure time (t90) of S-SBR compound decreased with increase in the 1,4-unit content, whereas it increased with increase in the 1,2-unit content. Cure rate index of S-SBR compound increased with increase in the 1,4-unit content, whereas it decreased with increase in the 1,2-unit content. Comparing cure characteristics of S-SBR_NO and S-SBR_EO compounds with the same 1,2-unit content, t90s of S-SBR_EO compounds were longer than those of S-SBR_NO ones and cure rate indi- ces of S-SBR_EO compounds were smaller than those of S-SBR_NO ones.

Influence of Microstructure and Extender Oil on Cure Characteristics of Solution SBR Compounds