Tensile,Tear and Swelling Properties of ENR 50/SBR Blend

摘要

Tensile strength,tear strength and swell index of epoxidized natural rubber (ENR 50) blended with styrene-butadiene rubber (SBR) was studied.The blend ratio was varied from 0-100% of ENR 50.Accelerated-sulfur conventional vulcanization system was used throughout the study.Tensile property and tear strength of the blend were determined by Monsanto Tensometer(Model T10) and toluene was used as the solvent in the swell index experiment.Results show that tensile strength and elongation at breeak increases with ENR 50 up to about 70% ENR 50,whereas for the tear strength,it increases steadily with increasing ENR 50,an observation which is attributed to strain-induced crystallization of ENR.Similar behavior was observed with the aged sample though its absolute value is lower than that of the unaged sample.As for the sweel index,it decreases gradually with increasing ENR indicating the increase in polarity of the blend as the blend ratio of ENR 50 is increased.