engleski

Change of Network Structure of Natural Rubber Vulcanizate with Thermo Ageing

Rubber network formation is know to be dependent on the nature of the crosslinking agent. In turn, crosslink density produced does decisively determine rubber physicochemical properties and service life. The amounts of sulphur accelerators added should be balanced accordingly to the expected rates of sulphur donation reactions to double bonds of polyisoprene elastomer. Three systems of accelerations were applied to natural rubber, NR vulcanisations. First, zinc diethyldithiocarbamate, ZDEC ; second, zinc mercaptobenzothiazole, ZMBT ; and a third, i.e. the combination of ZMBT and diphenylguanidin, DPG. Thermo-oxidative ageing in hot air was carried out afterwards and the crosslink-density determinations of the aged samples were studied. Two methods were used, stress-strain measurements as well as equilibrium swelling.

Natural rubber

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