Bulg. J. Phys. vol.28 no.1-2 (2001), pp. 85-94

Dynamic Mechanical Properties of Polymer Blends of Polypropylene and PoIy(Ethylene-co-Vinyl Acetate) Irradiated with Fast Electrons

M. Mihaylova1, M. Kresteva1, J. Perena2, P. Phillips3
1Faculty of Physics, Sofia University St Kl. Ohridski, 1164 Sofia, Bulgaria
2Instituto de Ciencid i Technologia de Polimeros, Madrid
3University of Thenessy, Knosvill, USA
Abstract. Extruded blends of polypropylene (PP) and poly (ethylene -co-vinyl acetate) (EVA) irradiated with fast electrons were studied. The dynamic mechanical properties were investigated with respect to the blend composition and irradiation dose. Two glass transition temperatures corresponding to the glass transitions of the pure components were observed. Their existence is an evidence of the immicibility of the components. Nevertheless, the peaks broadening, the single jump in the storage modulus values and the changes of Ty with the blend ratio suggest the creation of an interface region, leading to the improvement of the compatibility of the components. The irradiation with fast electrons at doses higher than 100 kGy results in single Ty transition because of the broadening of the interface layer.

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