Abstract
The molecular mobilities and structures of the butadiene-nitrile (SKN) and ethylene-propylene (SKEP) rubber vulcanizates, containing polyfunctional unsaturated compounds (PFUC), have been investigated. Examination of the continuous and individual relaxation spectra of physical stress, recorded on SKN-18 vulcanizates as a function of structure, has led to 4–5 elementary processes being identified. Four such processes have been found for SKEP vulcanizates not containing PFUC and 5 in the samples containing the latter. We show here that the additional and rapid stress relaxation process, detected on vulcanizates containing PFUC, is due to molecular chain mobility when the latter are situated at the surfaces of the largest PFUC aggregates. The relative contribution made to the relaxation processes which are associated with the large PFUC aggregates does not exceed about 30%. The microbundles containing the minimal PFUC structures are typified by the largest relaxation periods.
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