This paper explores the use of silica as a major component, 67% and 100%. of total filler content in natural rubber, carbon black being the minor component. In order to overcome the mixing difficulty, a coupling agent was used. A previous study dealt with the causes of difficulty in extruding high-silica and all-silica compounds. A premature reaction of the coupling agent with natural rubber resulted in wavy extrudates. In the case of a 100% silica compound, the filler dispersion and distribution were not sat…
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