Radiation-induced graft polymerization of N-vinylpyrrolidone onto segmented polyurethane based on isophorone diisocyanate

A segmented polyurethane (PUR) sample based on isophorone diisocyante was modified by radiation induced-graft polymerization of N-vinylpyrrolidone. Radiation grafting was carried out by the mutual irradiation method to improve hydrophilicity of the matrix surface. Different parameters affecting the grafting yield, such as effect of dose, monomer and mineral salt concentration, were investigated. It was found that degree of grafting increased with increasing total dose and monomer concentration in the presence of small amount of homopolymer suppressor.Physicochemical properties of the control and grafted PUR were studied using infrared spectroscopy (ATR-FTIR), thermogravimetric analysis, atomic force microscopy and X-ray photoelectron spectroscopy. The wettability was evaluated by contact angle measurements.