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ABSTRACT:Results of Monsanto rheometic studies and measurements of physical properties reveal that precipitated silica interacts chemically with epoxidized natural rubber (ENR) during high temperature (180°C) molding and the extent of chemical interaction increases in the presence of silane coupling agent, namely N-3(N-vinyl benzyl amino) ethyl-␥-amino propyl trimethoxy silane monohydrogen chloride. Fourier transform infrared spectroscopic studies show that silica is bonded to ENR through formation of Si-O-C bond, whereas in the presence of silane coupling agent, silica is bonded to the coupling agent through Si-O-Si bond, and ENR is bonded to the coupling agent through C-N-C bond formation.

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High-temperature (180°C) molding of epoxidized natural rubber (ENR) filled with precipitated silica leads to chemical bond formation between epoxy groups of ENR and silanol groups of silica. The extent of chemical bond formation is further enhanced in the presence of the silane coupling agent N-3-N-(vinyl benzyl amino)ethyl-␥-amino-propyl trimethoxy silane mono hydrogen chloride (trade name Z-6032). The results of hysteresis loss measurements show that hysteresis loss increases with increase in coupling agent loading as a result of the higher modulus of the compounds compared to that of the ENR-silica mix. The dynamic mechanical property measurements show that the addition of coupling agent increases the glass-transition temperature. Whereas strain-dependent dynamic mechanical properties show that filler structure breakdown increases with increasing loading of coupling agent. Sulfur-cured systems show higher filler structure breakdown compared to that of nonsulfur systems.

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