STUDIES ON RELAXATION SPECTRUM OF DYNAMIC STRESS OF CARBON BLACK FILLED RUBBER VULCANIZATES

Abstract

In this paper, we studied the relationship between the relaxation spectrum of dynamic stress and amount of weak physical bonds, broken in the process of relaxation, in SBR vulcanizates, containing various reinforcing carbon blacks, by using a transfer model, having three metastable states; and estimated the dynamic stress relaxation process with the following results:
(1) A non-linear part in the first relaxation process results from breaking of very weak ones of physical bonds between rubber molecules. And a linear part results from formation of stable structure by re-arrangement of the particules-dispersed structure.
(2) The second relaxation results from the relaxation of elements resistant to transformation of the system which have been stabilized in the first relaxation process and are not non-linear ones.