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Study of thermoelastic properties of ethylene-vinyl acetate copolymers and their mixtures with ethylene-propylene copolymer, polystyrene, and poly(vinyl chloride)

V. Pollák, A. Romanov, and K. Marcinčin

Polymer Institute, Slovak Academy of Sciences, 809 34 Bratislava


Abstract:  The thermoelastic properties of the ethylene-vinyl acetate copolymers (EVA) (ethylene content 67—79 weight %) as well as of the mixtures of EVA (ethylene content 55 weight %) with ethylene-propylene copolymer (EPc), polystyrene (PS), and polyvinyl chloride) (PVC) were studied. In all cases the dependence of equilibrium force (f) on temperature showed a discontinuity caused by the crystallization of polyethylene segments of EVA. The values of relative energy contribution (fU/f) for EVA (ethylene content 67—79 weight %) in dependence on relative elongation (a) passed through a maximum in the elongation range 1.1—1.3 and reached the value —0.8 at elongation α = 1.5. The values of fU/f for the mixtures of EVA with EPc were directly proportional to the composition of the mixtures. fU/f for the mixtures of EVA with PS or PVC were not significantly influenced by the presence of filler.

Full paper in Portable Document Format: 303a273.pdf


Chemical Papers 30 (3) 273–280 (1976)

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