Radiation-induced grafting of N-isopropylacrylamide onto the brominated poly(2,6-dimethyl-l,4-phenylene oxide) membranes

摘要

A novel thermo-sensitive switching membrane has been prepared by radiation-induced simultaneous grafting N-isopropylacrylamide (NIPAAm) onto brominated poly(2,6-dimethyl-l,4-phenylene oxide) BPPO.In order to attain a high grafting degree,the effects of dose,dose rate,concentration of NIPAAm,concentration of inhibitor Cu~(2+),membrane thickness and solvents were investigated.The grafting process was characterized by FTIR spectroscopy and the highest grafting degree obtained was 7.87%.The thermo-sensitive property of the grafted membrane was measured by water flux (20-48 deg C).The results showed that the grafted membrane could respond instantly to environmental temperature changes,and there was a sharp change around the lower critical solution temperature as it is normally seen in PNIPAAm hydrogel.