Polypropylene (PP) is the most common commercial polymer of good mechanical and thermal properties however the polymer is degradable upon radiation processing. Irradiation with sterilizing dose of about 25 kGy initiates in polypropylene radicals that lead to undesired processes like chain scission, oxidative degradation or formation of oxygen containing polar groups. The sensitivity of polypropylene may be overcome by introduction of other constituents.

We investigated blends of polypropylene with copolymer poly(ethylene-co-vinyl acetate) (EVA). Samples of the blends were irradiated with electron beam to doses of 25 or 50 kGy. Thermal properties of the blends before and after irradiation were characterized by DSC measurements. Rheological properties were studied by Melt Flow Index (MFI) and apparent viscosity measurements. The behaviour of alkyl radicals in PP and EVA was investigated by EPR technique. The influence of several concentrations of EVA on radiosensitivity of PP/EVA blends was evaluated.

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