A novel polyimide(PI)/polypropylene(PP)solvent resistant nanofiltration(SRNF)composite membrane was prepared by interfacial polymerization(IP)of metaphenylene diamine(MPD)with 1

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5-benzene tetra acyl chloride(BTAC)on the surface of acrylamide grafted PP support.The effects of monomers concentration，ratio of imidizing solution were investigated.The chemical composition of barrier layer and morphology of the resulting membrane were characterized with Fourier transform infrared spectra(FTIR)and scanning electronic microscopy(SEM)，respectively.The rejection，permeation and solvent resistant performance of the resulting membranes were also determined.An orthogonal experiment showed that BTAC concentration was the first affecting factor.A non-defective fine PI selective layer was formed on the PP support，and the resulting membrane presented a negatively charged behavior.The optimized conditions were as follows：concentration of BTAC and MPD 2 g·L-1，8 g·L-1 respectively，and volume ratio among acetic anhydride，triethylamine and benzene in imidizing solution 1∶1∶10.Under an operating pressure of 0.5 MPa，the rejection rates of the resulting membrane to Na2SO4 and acid brilliant blue 6B were 93.8% and 96.9%，respectively.