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The article discusses a study which examined the grafting of styrene-butadiene-styrene (SBS) with dibutyl maleate (DBM), methacrylic acid (MAA) or maleic anydride (MAH) by cobalt γ-rays. Results of the study showed that the compatibility of PA6 blended with MAH- or MAA-grafted SBS exhibited significant improvement. Also included are information on mechanisms underlying compatibility enhancement and ineffectiveness.

Abstract: Poly(methacrylic acid) (PMAA) grafted polyethersulfone (PES) powder was prepared by γ-ray irradiation-induced graft polymerization. The existing of the PMAA side chains in the grafted powder was proved by FT-IR spectroscopy. Then, pH dependent microfiltration (MF) membranes were cast from PES-g-PMAA powder with different degree of grafting (DG) under phase inversion method. The contact angle, mean pore size and swelling behavior of MF membranes were measured. The morphology was studied and the water filtration property was also tested. The results showed that the mean pore sizes and filtration properties of MF membranes cast from PES-g-PMAA powder varied with pH. In the most variant case, the flux of acid solution was about four times as that of basic solution for the MF membrane cast from PES-g-PMAA with DG of 20.0%. [Copyright &y& Elsevier]