1975 Volume 3 Issue 2 Pages 87-90
According to Tobolsky et al. random scission of natural rubber vulcanizates occurs preferentially on the main chain regardless of the type of crosslinks. On the other hand, Berry and Watson reported that scissions occur preferentially at crosslinks, and Horikx and Edwards observed from swelling measurements that random scissions on the main chains occur by oxidative degradation but, at the same time, the probability of scissions at crosslinks should be considered.
The confusion arising from the above observations is settled in this paper. The oxidative and thermal degradation mechanisms of natural rubber vulcanizates which have carbon-carbon bond, carbon-monosulfur-carbon bond, and carbon-polysulfur-carbon bond crosslinks are classified and tabulated.