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Thai) 1:
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Contrary to what is claimed [II, this study has revealedthat conventional accelerator/sulphur compoundsof SBR with a sulphur to accelerator ratio of about1 .8, containing up to 50 pphr precipitated silica can befully cured when sufficient time is permitted for thecuring reactions in the rubbers to complete at elevatedcuring temperature . This is in spite of silica interferingwith the reaction mechanism of sulphur cure,and reducing the cross-link yield or extent of cure inthe rubbers.The introduction and progressive increases inthe loading of silica prolong the cure time anddecrease the rate of cure of these compounds significantly. Interestingly, silica has little or no effect onthe scorch time of the compounds, which remainsessentially independent of the filler loading.
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