A composite ultrafiltration membrane containing poly(ethylene terephthalate)(PET) non-woven fabric substrate and a PET/PVA composite nanobrous barrier layer based on electrospinning technology and solvent treatment was demonstrated.And this solvent is a mixture of different ratios of acetone and water.The chemical structures of the ultrafiltration membranes surface were characterized in detail by Fourier transform infrared(FTIR) spectroscopy
and surface morphology changes of the top barrier layer after solvent treatment were observed by scanning electron micrograph(SEM).Besides
the influence of the glutaraldehyde(GA) concentration on the hydrolytic resistance of ultrafiltration membrane was also studied.Results reveal that the surface of membranes shows different morphology under the mixed solvent with different ratios of acetone and water
and the optimum proportion of acetone and water was 30/70(by weight); The average diameters of the PET fibers and PVA fibers were about 960 nm and 320 nm
respectively.The optimal hydrolytic resistance(weight loss ratio 2.12% and swelling ratio 3.62%) can be obtained when the dosages of crosslinker was 2 wt%.In addition
the result of FTIR indicated that the hydraxyl amount decreased and the groups such as C=O
COC were introduced to the surface of composite ultrafiltration membrane by cross-linking between PVA and GA.