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 solid 13C CP-MAS NMR.The grafting degrees of PEG-OH were calculated from 1H-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.