Amphiphilic graft copolymers having poly（phthalazinone ether sulfone ketone）（PPESK） backbones and poly（ethylene glycol） side chains were synthesized through a modified Williamson ether method.Initially,chloromethylated PPESK（CMPPESK） was prepared using chloromethylether as chloromethylation agent.Then,PPESK-g-PEGs were synthesized via the coupling of CMPPESK with alkoxides formed from PEG mono methyl ether（PEG-OH） and sodium hydride.Two PEG-OHs with the average molecular weight of 350 g/mol and 750 g/mol,respectively were used as the grafting reactants.The grafting of PEG-OHs onto PPESK backbones was confirmed by FT-IR,1H-NMR and solid13C CP-MAS NMR.The grafting degrees of PEG-OH were calculated from1H-NMR analysis,and the obtained results were approximately consistent with those from TGA analysis.The resultant PPESK-g-PEG copolymers were hydrophilic,but water insoluble,rendering them potential candidates as surface modifying additive for PPESK porous membranes.
