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265Vol.26,No.520105POLYMERMATERIALSSCIENCEANDENGINEERINGMay2010,,,(,,300160):(PVA),(PTFE)PTFE,,(SEM):(1)PTFEPTFE;(2)PTFE,DMAPTFE;(3)PTFE,:;;;:TB383:A:100027555(2010)0520123204:2009204207:(863)/(2007AA030304):,,E2mail:cfxiao@tjpu.edu.cn,,,,PTFE[1,2]PTFE(2233)10-3N/m,[3]PTFE,,PTFE[4]PTFE[5],PTFE,,PTFEPVA,PTFEPTFE/PVA,PVAPTFE11.1PVA:2099,;PTFE:FR301B,,Tab.1Tab.1CharacteristicsofPTFEsuspensionSolidcontent(%)Nonionicsurfactantcontent(%)Averageparticlesize(m)Viscosity(Pas)Density(g/cm3)pH6050.192510-32.209note:typicalvalues1.2PTFEPTFE,3802min,PTFEPTFEPVA,0,PTFE/PVAPTFE/PVA3802minPTFE,P2PTFE1.31.3.1:BrukerTen2sor37(FT2IR),(ATR);NET2ZSCHDMA242C(DMA),10/min,,-100200;NETZSCHSTA409PC,10/min,,100700;FEIQuanta200(SEM)1.3.2:JYSP21805,10s,22.1FT2IRPTFEPTFE/PVA(5/1,10/1,15/1)P2PTFEFT2IRFig.11250cm-1PTFECF2,1149cm-1CF2,638cm-1CF2[6]Fig.1aFig.1bFig.1c,PTFE,PVA,3291cm-1OH,2940cm-11447cm-1851cm-1CH2Fig.1a,Fig.1bFig.1c,PTFEPVA,PVA,2360cm-1,PTFE,PVAP2PTFEPTFEFig.1FT2IRspectraofmembranesPTFE/PVAa:5/1;b:10/1;c:15/1;P2PTFE:a:5/1;b:10/1;c:15/1;P:PTFE2.2PTFE(Fig.2),PTFE,;PTFEFig.2(acd),PTFE/PVA,Fig.2bPTFE,Tg,PTFE/PVA,PVAPTFE,TgPTFEbd,c,,PTFE,PTFEFig.2DMAdiagramofmembranesamplesa:PTFE/PVA;b:PTFE,relaxsintering;c:P2PTFE,fixedsin2tering;d:P2PTFE,relaxsintering(a)(b)Fig.3ThermogravimetrycurvesofmembranesPTFE/PVA:a:1/0;b:15:1;c:10:1;d:5:12.3Fig.3(Fig.3a)(Fig.3b)Fig.3a,PTFE/PVA,200400,4212010500700PVAPTFEPVA,PVA,365,400,PVA,,PTFE,FT2IRPTFE,Fig.3a,569,P2PTFE,PVAP2PTFEPTFE2.4PTFE,PTFE114115,1%[7],PVA-OH,,[8]3,Tab.2Tab.2WatercontactangleofPTFE/PVAmembraneandPTFEmembranesSamplePTFE/PVAmembraneP2PTFEmembranePTFEmembraneAveragevalue63.20109.21119.23Tab.2,PTFE/PVA63.20(Fig.4a),P2PTFE109.21(Fig.4b),PTFE(Fig.4c),,PVAP2PTFEFig.4Fig.4WatercontactangleofmembranesFig.5SEMmicrographsofP2PTFEandPTFEmembrane2.5Fig.5P2PTFESEM,PTFE/PVAPVA,,PTFE,SEMFig.5,P2PTFE,(Fig.5a),,PVA,PTFE,PVA,,PTFE,(Fig.5b);,P2PTFE,PTFE,(Fig.5b)Fig.5d,PTFE(Fig.5d),PTFE,,P2PTFEPTFE,,5215:,(Fig.5aFig.5c)PTFE3PVA,PTFEPTFE,PVAPTFEPTFE,PTFE:[1]GOESSIM,TERVOORTT.Melt2spunpoly(tetrafluoroethylene)fibers[J].J.Mater.Sci.,2007,42:798327990.[2]TUCY,LIUYL,LEEKR,etal.Hydrophilicsurface2graftedpoly(tetrafluoroethylene)membranesusinginpervaporationdehydra2tionprocesses[J].J.Membr.Sci.,2006,274:47255.[3]NEWMAND,MORIZIOF,KIDDS.Porouspolytetrafluoroethyelnemembrane:US,6,274,043[P].2001208214.[4],.PTFE[J].,2003,(2):19222.CHENSM,LIAQ.PreparationandporeperformanceofbiaxialstretchingPTFEmicroporousmembrane[J].Membr.Sci.Tech2nol.,2003,(2):19222.[5]BOSSECF,KOWLIGIRR.UniformlyexpandedPTFEfilm:US,5321109[P].1994207214.[6]CHENYC,TSAICC,LEEYD.PreparationandpropertiesofsilylatedPTFE/SiO2organic2inorganichybridsviasolgelprocess[J].J.Polym.Sci.,2004,(42):178921807.[7]LIUYL,YUCH,LAIJY.Poly(tetrafluoroethylene)/polyamidethin2filmcompositemembranesviainterfacialpolymerizationforper2vaporationdehydrationonanisopropanolaqueoussolution[J].J.Membr.Sci.,2008,315:1062115.[8]LIN,LIUZZ.Dynamicallyformedpoly(vinylalcohol)ultrafiltrationmembraneswithgoodantifoulingcharacteristics[J].J.Membr.Sci.,2000,169:17228.PreparationandPropertiesofPoly(Tetrafluoroethylene)MembraneHUANGQing2lin,XIAOChang2fa,HUXiao2yu,BIANLi2na(DepartmentofMaterialScience&ChemicalEngineering,TianjinPolytechnicUniversity,theKeyLaboratoryofHollowFiberMembraneMaterialandProcessofMinistryofEducation,Tianjin300160,China)ABSTRACT:Poly(tetrafluoroethylene)(PTFE)hydrophobicmembraneswerepreparedbythePTFEconcentratedsuspensionwithpoly(vinylalcohol)(PVA)asmembranecarrier.Theconstitution,thermalstability,dynamicme2chanicalperformanceofthemembranewerestudied.Thestructureandmorphologywerecharacterizedbyscanningelectronicmicroscopy(SEM).Resultsshowthat:(1)thereisnoobviousdifferenceinconstitutioncomparedwithpurePTFE.(2)thereisnochangeonthedynamicmechanicalanalysis(DMA)transformationtemperatureofthemembranebythefixedsettingsinteringandtherelaxsettingone.(3)themicroporesamongthefibrilsnetnodesinthemembraneareloosebyfixedsettingsinteringwhilecompactbyrelaxsettingsintering.Keywords:poly(tetrafluoroethylene);PVAmembranecarrier;flatsheetmembrane;property6212010