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1、第24卷第2期高校化学工程学报No.2Vol.242010年4月JournalofChemicalEngineeringofChineseUniversitiesApr.2010文章编号：1003-9015(2010)02-0336-04凝固浴组成和温度对PVDF疏水微孔膜结构与性能的影响1,21,22李倩,许振良,吕洁(1.华东理工大学化学工程联合国家重点实验室,上海200237;2.华东理工大学化学工程研究所膜科学与工程研发中心,上海200237)摘要：利用非溶剂相转化法(NIPS)，以聚偏氟乙烯(PVDF)/磷酸三乙酯(TEP)-N,N-二
2、甲基乙酰胺(DMAc)为铸膜液体系，乙醇水溶液为凝固浴制备高性能的PVDF疏水微孔膜。考察了凝固浴中乙醇(EtOH)含量及凝固浴温度对PVDF成膜分相速率、膜结构和膜疏水性的影响。实验结果表明，在20℃的凝固浴温度下，凝固浴中乙醇含量的升高减慢了铸膜液体系的分相速率，提高了PVDF膜的孔隙率；在凝固浴中添加60%(wt)的乙醇，可形成表面荷叶状结构和截面对称的海绵状结构，膜表面的接触角为130.3，呈很强的疏水性，并具有较优的膜强度。关键词：聚偏氟乙烯(PVDF)；凝固浴组成；凝固浴温度；疏水性中图分类号：O648.22；TB383文献标识码：A
3、EffectofCoagulationBathCompositionandTemperatureonMorphologyandPropertyofMicroporousPVDFHydrophobicMembrane1,21,22LIQian,XUZhen-liang,LÜJie(1.StateKeyLaboratoryofChemicalEngineering,EastChinaUniversityofScienceandTechnology,Shanghai200237,China;2.ResearchandDevelopmentLaborato
4、ryofMembraneScienceandEngineering,ChemicalEngineeringResearchCenter,EastChinaUniversityofScienceandTechnology,Shanghai200237,China)Abstract:Microporouspoly(vinylidenefluoride)(PVDF)hydrophobicmembraneswerepreparedviaanon-solventinducedphaseseparation(NIPS)method.UsingPVDF/trie
5、thylphosphate(TEP)-N,N-dimethylacetamide(DMAc)ascastingsolutionandamixtureofwaterandethanol(EtOH)ascoagulationbath,themicroporousPVDFhydrophobicmembranewithgoodperformancewasprepared.Theeffectsofcoagulationbathcompositionandtemperatureonthedemixingrate,membranemorphologyandhyd
6、rophobicityofthepreparedmembraneswereinvestigated.Theexperimentalresultsshowthat,at20℃,increasingtheEtOHcontentinthecoagulationbathwillslowtheprecipitationprocessandincreasetheporosityofthepreparedPVDFmembrane.Theadditionof60%(wt)EtOHtothecoagulationbathresultsinalotusleaftype
7、arrangementofPVDFsolidprotrusionsspreadingonthemembranetopsurfaceandthespongestructurefullingthewholecrosssectionofthemembrane.Thepreparedmembraneshowsanexcellentmechanicalpropertyanditscontactanglecanreach130.3°,whichindicatesthatthepreparedmembranehasahighhydrophobicity.Keyw
8、ords:PVDF;coagulationbathcomposition;coagulationbathtemperatu
