PVDFCA共混超滤膜制备及其特性的研究

:1007-8924(2002)06-0004-05PVDF/CA共混超滤膜制备及其特性的研究王湛吕亚文王淑梅尹妮刘淑秀钱英(,100022):以醋酸纤维素(CA)作为第二种聚合物成分与聚偏氟乙烯(PVDF)共混,采用相转化法流涎成膜;测试了膜的化学稳定性抗污染性能以及亲水性等性质,对影响膜性能的主要因素进行了考察;利用DSC扫描等多种手段对PVDF和CA的相容性作了初步探讨.:聚偏氟乙烯;醋酸纤维素;共混;膜污染;相容性:TQ028.8:A.,;.,.,.PVDF,,,.,[1,2];,[1,3],.PVDF////[4~7],PVDF/CA.,L-S,.1111(FR904),;(CA398),”MW30000,NELSONSACETATELTD;,(DMAc),.1.111;21;31;41;51;61;711.2,L-S.1.3,0.2MPa1mg/mL;JJC-1;HClNaOHH2O2;DSC(Tg),.1.4m,,:2001-11-12;:2002-02-01:(D050301-00):(1966-),,,,,.226Vo1.22No.6200212MEMBRANESCIENCEANDTECHNOLOGYDec.2002Jv=$pL(Rm+Rbl+Rf)=$pL@Rt(1),L;Rm;Rbl;Rf;Rt;$p.,(1)J0=$pLRm(2),(1)J2=$pL(Rm+Rf)(3)L,Rf=Rm1J0-J2J22=mRm(4)m,,m,,.2结果与讨论2.1PVDF/CA()2CAo),L/(m2#min);v),(b);@),%;p),%2%2,PVDF/CA,CA,,CA40%,,PVDFCA.CA,,,,;CA,CA,,CAPVDF,,,.,95%;CA,6B4,.,PVDFCA.,CAPVDF.,CA,,6B4.,,,9B1.2.21,,DMAcPVDF/CA,8B2,,9B1.表1不同溶剂时共混比对相容性的影响(DMAc)(DMF)N-(NMP)9B18B25B52B81B9NDJ-1PVDF/CADMFDMAc15%,3.3,PVDF/CADMFDMAc,CAS,PVDF/CA,9B1,.3PVDF/CA2,,4B6,Tg,,.9B16:PVDF/CA#5#,PVDFTg,CA,PVDF,CA,,,.表2不同共混比时的玻璃化转变温度e9B14B6PVDFCAPVDFCAPVDFCA-4767.5367.66-28.654.71114.5383.31:.2.32.3.13,LiCl,LiCl,,,,LiCl.LiClDMAc,X,,Li+,Cl-,)CONH),,.,LiCl.,,CA,.,LiCl,9B1.LiCl.表3共混比为9B1时添加剂对共混相容性及膜性能的影响/(mPa#s)J/(mL#cm-2#h-1)/%29755894.26407549.596.61275067.595.35PVP(K30)29006292.82PEG60036502.3.24,,,,().LiCl,,,,.,LiCl,,.(a)(b)4(9B1)4,9B1,2%LiCl,,80mL/(cm2#h),96%.LiCl,;CA,9B1,CA,LiCl.2.45,DMAc,.,,DMAc25%,.,DMAc,,.2.5mPVDF9B1,18%m,4.4,mH,#6#22(a)(b)5表4膜的阻力增大系数/(mL#cm-2#h-1)/(mL#cm-2#h-1)/(b)PVDF12.751.440.9161.14PVDF220.3812.50.639B117.512.20.4360.95PVDF.2.6PVDFCA9B1(pH=1)(pH=14),100h,,5.,CA表5膜的化学稳定性/(mL#cm-2#h-1)/%/%/%HCl(pH=1)PVDF6.06.2+3.397.295.4-1.99B149.554.6+10.396.690.3-6.5CA26.094.8NaOH(pH=14)PVDF6.08.3+38.997.291.4-6.09B149.555.7+12.596.691.8-5.0H2O2PVDF6.06.6+1.697.297.0-0.29B149.555.0+11.196.694.2-2.5CA26.037.5+44.294.884.1-11.3pH1,,,,,PVDF.5,9B1PVDF,,.,CA,PVDF,,.3结论1)DSC,PVDF/CA,:,PVDFCA,PVDF/CA=9/1,;PVDF/CA=9/1,15%,,49.5mL/(cm2#h)96%,PVDF6.25.2)CA0100%,61.1b42.8b,PVDF,,.3),PVDFCA,PVDF.4),6:PVDF/CA#7#;2%~8%,,,;,LiCl,,.[1].[M].:,1987.58~59.[2],,,.[J].,1995,15(1):40~45.[3].[M].:,1980.245.[4],,,./[J].,2001,21(2):1~5.[5],,,./[J].,2000,20(5):10~15.[6],.[A].[C].:,1994.17~23.[7],.PVDF/PS[J].,1997,23(2):131~134.StudyonthepreparationandcharacteristicsofPVDF/CAblendultrafiltrationmembraneWANGZhan,LBYawen,WANGShumei,YINNi,LIUShuxiu,QIANYing(CollegeofEnvironmentandEnergyEngineering,BeijingPolytechnicUniversity,Beijing100022,China)Abstract:ThePVDF/CAblendultrafiltrationmembranesweremadebyphasereversemethod,whichwerecharacterizedbywaterflux,proteinretention,chemicalstabilityandantifouling.Theeffectsofthepreparationparameterssuchasaddictivespecies,coagulationbathandthemassratioofPVDFtoCAonthemembranceper-formancewereinvestigated.AndthecompatibilitybetweenPVDFandCAwasearlydiscussed.Keywords:PVDF;CA;blend;membranefouling;compatibility(BCC),,,.BCC/0,,(AAGR)8.3%,2005,24.(RO)20002.38,8.3%;(NF)RO,0.33.RONF7.9%,20053.97.(UF)2.48,7.6%,20053.52.2000,(MF)7.07,9.7%,200510.25.,8.7%.,200075%,12.1/3,,2005,70.BCC,30,,RO,,.NF,.UF,,.,UF.MF..,,,.,,,,,,,,,.,,,.,.()#8#22