Influence of Carbonized Rubber Seed Shell as Filler on Vulcanisates from Blends of Natural Rubber and Epoxidized Low Molecular Weight Natural Rubber

Abstract

Studies into the use of carbonized rubber seed shell as a filler in formulations for blends of natural rubber (NR) and epoxidized low molecular weight natural rubber (ELMWNR) prepared using the semi-efficient sulphur vulcanisation system were carried out. The rheological properties (cure rate, cure time, t₉₀ and scorch time, t₂), physico-mechanical properties, solvent resistance, solubility and swelling properties of the vulcanisates showed carbonized rubber seed shell behaving as a plasticizer/softener in the mix. From the properties investigated, replacement of carbon black with 15% carbonized rubber seed shell will not make any serious deleterious effect on the vulcanisate, also carbonized rubber seed shell can be used as a filler in products where softness is anticipated. Above all, the properties obtained from the carbonized rubber seed shell vulcanisates are within the accepted level for natural rubber mix.