Abstract
AbstractOn line investigation of molecular chain scission during mechanical loading of unfilled, unvulcanized natural rubber is possible using the “Exoemission” method. Especially, it can be shown that chain scission is force controlled, i.e. there is no significance for energy control. The emission rate, assumed proportional to the rate of chain fracture, can be described by the rate theory of Eyring[1]. The average molecular mass of a chain between two elastically effective entaglements MC, estimated by the theory of Mooney and Rivlin is linear correlated with the activation volume of the force controlled chain scission determined from the emission intensity.The experimental data further indicated a strong dependence of crystallisation kinetics and associated molecular fracture processes on the velocity of loading.
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