Study on solution SBR with modified chain end for fuel efficient tyres

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Study on solution SBR with modified chain end for fuel efficient tyres

Sone, T. / Yuasa, T.

The review outlines the latest findings from on-going research on end-modified S-SBR aimed at producing low hysteresis loss silica compounds. Reduction in hysteresis loss does not simply entail the introduction of specific functional groups: it is important to place two different functional groups at the SBR chain end. In particular, when a primary amino group is attached next to an alkoxysilyl group at one end of the SBR chain, a resilient chemical bond is formed with the silica surface, improving the dispersibility of the silica in the mixing step of compound production. The results of tests on the properties of both the uncured rubber and vulcanisates have demonstrated a great reduction in hysteresis loss. The dispersibility of silica in rubber compounds by the Payne effect was evaluated in dynamic viscoelasticity measurements. Analysis making complementary use of the results from TEM observations and USAXS experiments as reviewed above has shown that, in low hysteresis compounds, silica is evenly dispersed as fine aggregates, and that this tallies with the dynamic viscoelasticity observations. It was shown quantitatively that end-modified S-SBR is effective in improving silica dispersibility. The investigation and the development of the S-SBR now attracting interest as fuel-efficient tyre material contribute to the solution of environmental problems.