Preparation and properties of polysulfone microporous membrane based on modified reverse thermally induced phase separation
In view of the poor stability of polysulfone(PSF)microporous membrane-forming system prepared by reverse ther-mally induced phase separation(RTIPS),firstly,the end capping of the hydrophilic hydroxy-terminated hyperbranched polyester(HBPE)was carried out,then the quaternary membrane-forming system of PSF/HBPE/N,N-dimethylacetamide(DMAc)/polyethyl-ene glycol 400,which featured a low critical solution temperature(LCST),was constructed by using PSF as the membrane material and end-capped HBPE as hydrophilic additive.The hydrophilic PSF microporous membranes were prepared by modified-RTIPS(m-RTIPS)in one step.Structural analysis and molecular weight testing were conducted on the end-capped HBPE,the effects of differ-ent end-capped ratios of HBPE on the cloud point and viscosity of the membrane-forming system were analyzed,and the effects of end-capped ratios on the morphology,permeability,hydrophilicity,anti-fouling and mechanical properties of PSF microporous membranes were studied.The results show that the end capping of HBPE is finished successfully and the molecular weight of HBPE increases after end capping.The cloud point and viscosity of the membrane-forming system increase with the increase of the end-capped ratio of HBPE,but the increase of the viscosity is less.The pure water flux,rejection rate,hydrophilicity and mechanical properties of the three PSF microporous membranes with different end-capped ratios of HBPE are superior to those of the pure PSF microporous membranes.With the increase of end-capped ratio of HBPE,the pure water flux of the prepared membranes decrease and the retention rate have little difference.When the end-capped ratio of HBPE is 30%,the pure water flux recovery rate of PSF membrane is 88%,and the anti-fouling property is the best.The membranes with porous surface are obtained by adding HBPE with different capped ratios.When the end-capped ratio of HBPE is 50%,the PSF membrane presents full bicontinuous morphology,and the tensile strength,tensile modulus and elongation at break are 4.86,143.92 MPa and 22.68%,respectively,indicating excellent mechanical properties.
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