纺丝条件对PVDFPVP共混中空纤维膜性能的影响张东海

3711201111TECHNOLOGYOFWATERTREATMENTVol.37No.11Nov.,2011PVDFC－F486kJ·mol-1、[1]。、、[2]。PVDF[3]。PVDFPEG、PMMA、PAN、6PA6、CA、PVP[4]。PVDFPVDF[5]PVDF/PVP。PVDF/PVP。、、、J、R、σb、δPVDF/PVP。11.1PVDF6020K30PVPN,N-DMAc43000。1.2PVDF、PVP66%DMAc60℃24h60℃。10℃0.2MPa60%、、、4。24h。1.3PVDF/PVPFTIR-8400S5μm4cm-15mm·s-1WXRDD/max2500PVDF/PVP1121111.7100552.710055-PVDF/PVP、、、、、、。3.28m·min-1。60℃48h2s3.28m·min-1。PVDFPVPTQ028.8A1000-3770(2011)11-0026-0042011-04-01-20096120110010“13115”[e-mail]26DOI:10.16796/j.cnki.1000-3770.2011.11.006PVDF/PVP2θ=5～50°4°·min-1JSM-5800、20kV。1.4、HY/T050－1999。、HD021NS500mm·min-1100mm。22.1PVDF/PVP1PVDFPVDF/PVPIR1700cm-1PVPC＝OPVP。2PVDFPVDF/PVPWXRDPVDFa、b、d2θ=18.3°、19.7°21.4°α100、020110PVPc2θ=20.26°βe2θ=26°α[6]。WXRDPVDF/PVPPVDF。2.2PVDF/PVP2.2.120、40、60℃5℃48h、2.73m·min-1、2s。1。3SEM60℃20℃。。[7]。60℃。2.2.2248、72h60℃2.73m·min-12s。2。4SEM。1Tab.1Effectoftemperatureofcoreliquidonperformanceofmembranes/℃J/L·m-2·h-1R/%σb/MPaδ204060212.81209.43202.2794.549093.622.102.402.481.291.421.721PVDFPVDF/PVPIRFig.1IRofPVDFandPVDF/PVPhollowfibermembrane30002500200015001000T/%
/cm2XRDFig.2XRDofhollowfibermembrane51015202530
2
3SEMFig.3SEMmicrographsofhollowfiberfordifferenttemperatureofcoreliquid3a20℃3b40℃3c60℃273711、[8]。2.2.3560.5～11s60℃48h2.73m·min-1。5、6、、。7SEM11s。60℃。、。2s275.73L·m-2·h-195.60%2.1MPa1.56。2.2.4892.73～5.46m·min-160℃、48h。、3.28m·min-1。。。8、9
4a48h4b72h4SEMFig.4SEMmicrographsofhollowfiberfordifferenttimeofdeaeration2Tab.2Effectoftimeofdeaerationonperformanceofmembranes/hJ/L·m-2·h-1R/%σb/MPaδ4872276.12165.2097.2297.342.002.471.141.4902468101250100150200250300350R/%J/Lmh
/s9192939495969798991005Fig.5Effectoftimeofevaporationonwaterfluxandrejectionration0246810121.01.11.21.31.41.51.61.71.81.92.0
/MPa
/s2.02.12.22.32.42.56Fig.6Effectoftimeofevaporationontensile-strengthandelongationatbreak7b2s7c6.5s7SEMFig.7SEMmicrographsofhollowfiberfordifferenttimeofevaporation7d11s7a0.5s28PVDF/PVP3.28m·min-1250.37L·m-2·h-192.04%3.16MPa2.84。3。、、。、。。60℃48h2s3.28m·min-1。[1]DohanyJE,RobbLE.Polyvinylidenefluoride:kirkothmerencyclopediaofchemicaltechnology[M].NewYork:Wiley,1980:64-74.[2]BottinoA,CapannelliG,MonticelliO,etal.Polyvinylidenefluo-ridewithimprovedfunctionalizationformembraneproduction[J].JournalofMembraneScience,2000,166:23-29.[3]YoungTH,ChengLP,LinDJ,etal.MechanismsofPVDFmembraneformationbyimmersion-precipitationinsoft(1-octanol)andharsh(water)nonsolcents[J].Polymer,1999,40:5315-5323.[4],,.PVDF/PVA[J].,2007,12(38):1975-1980.[5]DongliangWang,KLi,WKTeo.PorousPVDFasymmetrichollowfibermembranespreparedwiththeuseofsmallmolecularadditives[J].JoumalofMembrenceScience,2000,178:13-23.[6]LinDJ,ChangCL,HuangFM,etal.Effectofsaltadditiveontheformationofmicroporouspoly(vinylideneflu-oride)membranesbyphaseinversionfromLiClO4/water/DMF/PVDFsystem[J].Polymer,2003,44:413-422.[7],,.PVDF[J].,2002,2:171-176.[8],,.[J].,2002,22:7-12.23456220225230235240245250255260R/%J/Lmh
/mmin9192939495969798991008Fig.8Effectofdrawingspeedonwaterfluxandrejectionration9Fig.9Effectofdrawingspeedontensile-strengthandelongationatbreak234562.42.52.62.72.82.93.03.13.23.33.43.5
/mmin
/MPa1.01.52.02.53.03.54.0EFFECTOFSPINNINGCONDITIONSONCHARACTERISTICSOFPVDF/PVPHOLLOWFIBERMEMBRANEZhangDonghai1,WangLei1,MengXiaorong2,WangXundong1，LiWei1,YuanWei1（1.SchoolofEnvironmental&MunicipalEngineering,Xi′anUniversityofArchitectureandTechnology,Xi′an710055,China;2.SchoolofScience,Xi′anUniversityofArchitectureandTechnology,Xi′an710055,China）Abstract:Infraredanalysisandwide-anglepowderdiffractionwereusedtoinvestigatethecharacteristicsofthemembranecompositionandcrystallinenatureofthePVDF/PVPhollowfibermembranepreparedbydry-wetfilatureprocess,andtheinfluenceoftimeofevaporation,timeofdeaeration,drawingspeedandtemperatureofcoreliquidonPVDF/PVChollowfibermembranewerestudiedthroughpurewaterflux,rejectionration,tensile-strengthandelongationatbreak.Theresultsindicatedthatthetemperatureofcoreliquidhadnotobviouseffectonthepurewaterfluxandrejectionration,whilethetensile-strengthandelongationatbreakincreasedwiththeincreaseofthetemperatureofcoreliquid;withthebeginningofthetimeofdeaerationandthetimeofevaporationintheairincrease,thepurewaterfluxdeclinein,rejectionrationincrease,tensile-strengthandelongationatbreakaugmentation;drawingspeedandtensile-strengthandelongationatbreakwerepositivelycorrelated,whenitarrivedat3.28m·min-1thepurewaterfluxandrejectionrationperformancebest.Theoptimalspinningconditionswerethat,thetemperatureofcoreliquidat60℃,thetimeofdeaerationat48h,thetimeofevaporationat2s,thedrawingspeedarrivedat3.28m·min-1.Keywords：PVDF;PVP;temperatureofcoreliquid;timeofdeaeration;timeofevaporation;drawingspeed29