聚氯乙烯-聚乙烯醇的相容性及其复合多孔膜的结构与性能OA北大核心CSTPCD

Polyvinyl chloride-polyvinyl alcohol(PVC-PVA)composite porous membranes were prepared by solution filming,the compatibility of PVC-PVA was analyzed from the perspective of mixing enthalpy and inter-molecular interactions.The pore morphology,hydrophilicity,filtration performance and mechanical properties of the composite porous membranes were analyzed by scanning electron microscopy(SEM),contact angle measurement and plate ultrafiltration membrane test,etc.The research results show that hydrogen bonds and dipole interactions could be formed among macromolecules in PVC-PVA composite system,the mixing enthalpy show a trend of first increasing and then decreasing with the increase of the mass fraction of PVA in polymers,and PVC-PVA is generally partially compatible.Compared with pure PVC membrane,the"finger like pore"feature of the cross-section of PVC-PVA composite membrane became weaker,while the"sponge pore"feature became apparent,and the pure water flux of the composite prous membrane was increased,the pollution resistance was improved,and the mechanical toughness was enhanced.When the mass fraction of PVA in polymers was 9%,the pure water flux of the composite membrane was about 4 times that of pure PVC membrane,the retention rate of PEG100000 was 80%,the strength was 3.5 MPa,and the elongation at break was 26%,the composite has a good application prospect in the field of water treatment.