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223Vol.22,No.320065POLYMERMATERIALSSCIENCEANDENGINEERINGMay2006pHX1,2,1,1(1.,;2.,,300160):2pH,N,N2(PDMAEMA),,PDMAEMA,pH,,;pH;PDMAEMApH;pH:;;pH:TB383:A:100027555(2006)0320250204,,pH[1](IP)[2]:;;,IP,,IP,pH,pHIP,PDMAEMA,,(),pH2,pH11.1(DMAEMA):,98.3%,;(AIBN):,;(PSF):,;(PVP):K30,;N,N2(DMAC):,;:,,1.2:;:;MC226:2();pHS225pH:1.31.3.1PDMAEMA:DMAEMA,PDMAEMA,UFPDMAEMA,[5]1.3.2pH:X:2005204222;:2005207215:(863)(2002AA302619):,,10mmolöL11mmolöL7mmolöL10molöLHClNaOHpH,pHpH1.3.3:pH,:100mesh,W0(g)3%PDMAEMA,,5h,,35,Ww(g)pH12h,,Wd(g),[3]SR(%):SR=(Wd-Ww)ö(Ww-W0)1.3.4PDMAEMA:PDMAEMA,,77mm,AAA10mLPDMAEMA,,10mL,,(,),,,,1.3.5:,,30min,2göLMgSO4,;,(MC226)F=ö()R=(-)öpH,NaCl,0.1molöL22.1pHPDMAEMA,pH,pH,,pHFig.1pH,,,,,,,pHFig.1pHasafunctionofthetimeofcrosslinkingreactionFig.2pHasafunctionofswellingratio2.2pHPDMAEMASRpH(Fig.2),PDMAEMApH2pH4,;pH410,;pH10,,1523:pH2.3pH,PDMAEMApKa8.0,[4],,H+,,,;,OH-H+,,,OH-OH-,,,,,,pH,,pH7.98.5(Fig.3)2.4NaHCO3NaHCO3,(Fig.4),,NaHCO3,NaHCO30.14molöL(2%):(1),,;(2)pH,,,[5]Fig.3EffectofpHofPDMAEMAaqueoussolu-tiononthefluxandtherejectionofthecompositeNFmembranetestingcondition:0.8MPa,2göLMg2SO4,30.Fig.4EffectofNaHCO3concentrationonthefluxandtherejectionofthecompositeNFmembranetestingcondition:0.8MPa,2göLMg2SO4,30Fig.5EffectofpHonthefluxandtherejectionofthecompositeNFmembranetestingcondition:0.6MPa,0.5göLNaCl,25.2.5pH2.3,pH,,pH(Fig.25220065):pHpH,0.5göLNaCl3PDMAEMApH,pH,pH,PDMAEMApH,,pH,[6],,[7]:[1]Kosutick,etal.J.Membr.Sci.,2000,168:101.[2]YangMC,LinWC.JPolymerResearch,2002,9:135140.[3]KouJH,AmidonGL,LeePI.PharmaceuticalRe2search,1988,5(9):592597.[4]BruiningMJ,BlaauwgeersHGT,etal.Biomaterials,2000,21:595604.[5]CesarLiberatoPetzhold,JosemarStefens,LucianeLemosMonteavaro,etal.PolymerBulletin,2000,44:477484.[6]RoudmanAR,DigianoFA.J.Membr.Sci.,2000,175:6173.[7]WuMH,ChenJ,QianQ,etal.JRadioanalyticalandNuclearChemistry,2002,252(3):531535.pH-RESPONSIVECOMPOSITENANOFILTRATIONMEMBRANEWANGWei1,DUQi2yun2,RENLian2juan1,LIANGChang2liang1(1.KeyLaboratoryforHollowFiberMembraneMaterialsandMembraneProcess,MinistryofEducation,InstituteofMembraneScienceofTechnology,TianjinPolytechnicUniversity;2.MotianMembraneEngineeringandTechnologyCompany,TianjinPolytechnicUniversity,Tianjin300160,China)ABSTRACT:ThechangeofpHattheinterfaceofstaticliquid2liquidinterfacialpolymerization(IP)withreactingtimewasstudied.Andapositivechargedcompositenanofiltration(NF)mem2branewaspreparedbyIPtoachievecrosslinkedpoly[22(N,N2dimethylamino)ethylmethacrylate](PDMAEMA)gellayeronpolysulfone(PSF)membrane,usingPDMAEMAaspre2polymeranddi2benzylicagentascrosslinker.TheeffectofpHonswellingratio(SR)ofthehy2drogelandtheseparationperformancewerestudied.Theresultsshowthat,thequaternaryam2moniumsaltscreatedfromIParesolubleinbothphases,whichactasself2catalystinthereac2tion;theIPonthesupportmembraneshouldbecarriedinaspecificpHrange;theSRofPDMAEMAhydrogellayerexhibitobviouschangeswithpH;thepreparedcompositeNFmem2branehaspH2responsive.Keywords:polymergel;compositenanofiltrationmembrane;pH2responsive3523:pH