Effects of Sulfur Curing Systems on Mechanical Properties of NR/SBR Rubber Blends

13 March 2020, Version 4
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

A series of NR/SBR vulcanizates were prepared through three different vulcanization systems, conventional vulcanization (CV), effective vulcanization (EV) and semi-effective vulcanization (SEV) respectively, basing on each formulation and optimum curing time. We examined the mechanical properties of NR/SBR vulcanizates including tensile strength, tear strength, elongation at break, modulus, Shore A hardnessand and relative volume abrasion. The results indicated that NR/SBR vulcanizates prepared in different systems differed in mechanical properties. Vulcanizates prepared via CV showed higher tensile and tear strength; vulcanizates prepared via EV had high modulus and hardness, and vulcanizates prepared via SEV performed high abrasion resistance.

Keywords

sulfur-accelerant ratio
stress concentration
crosslink bond
crosslink density

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