Interaction of silica in dichlorocarbene modified styrene butadiene rubber

Author(s): M.T.Ramesan

Hydrated silica imparts better physical properties to polar rubbers, compared to those of hydrocarbon rubbers. The interaction of silica on dichlorocarbene modified styrene butadiene rubber (DCSBR) was evaluated with reference to their processing characteristics, technological properties and resistance to vulcanizate towards thermal, flame and oil resistance. The result indicates that with increasing filler content ratio of silica, the properties such as tensile strength, modulus, tear resistance, hardness, compression set, heat build up and flame resistance increaseswhereas elongation at break and resilience decreases. The changes in technological properties had been correlated with variation in cross-link density estimated from stress strain and swelling behavior. The results of the studies showed that silica could be used as excellent reinforcing filler for DCSBR. The mechanical properties such as tensile strength, modulus and hardness of the silica filled DCSBR were also evaluated after immersion in ASTM oil. Variation of bound rubber content of silica filled DCSBR and the influence of the extracting temperature on the bound rubber content was investigated and its activation energy was also calculated from the Arrhenius plot.

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