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Segmental relaxation in blends of polychloroprene and epoxidized polyisoprene

Dynamic mechanical measurements were conducted over a range of frequencies in the glass transition zone of an epoxidized (25 mol %) polyisoprene (UPI), polychloroprene, and miscible mixtures thereof. The neat polymers had nearly equal T g 's. Furthermore, they were found to exhibit very similar segmental dynamics, including their segmental relaxation times, functions, and temperature dependencies. Interestingly, however, blends containing a relatively high concentration of the UPI had shorter relaxation times (by up to an order of magnitude) than the neat components; that is, segmental relaxation speeds up upon mixing. This behavior is interpreted in terms of the decrease in intermolecular cooperativity in the mixtures relative to the neat components