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Dołączył: 26 Paź 2010
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Temat postu: abercrombie outlet Soft segment waterborne polyure |
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Soft segment waterborne polyurethane containing carboxyl of properties
DSoFTSEGMENTHuJinxinSUNDuoxianSUNZheDept. ofChem. Eng. & Techn. . TsinghuaUniversity, BeUing100084, China2SchoolofChem. Eng. & Techn. , 7 ~ anjinUniversity,[link widoczny dla zalogowanych], ~ anjin300072, ChinaAbstract: Analicyclicaqueouspolyurethane (PU) prepolymerswithsoftsegmentcontainingcarboxylWaSsynthesizedfromisophoronediscarnate (IPDI), dimethylolbutnoicacid (DMBA), p0lycapr0lact0ne (PCL) and2-propanol, followedbyneutralizationpendantcarboxylbytriethylamine (TEA) / KOH. Inthearticle, theeffectsofthetypeofcounterions, PUsolidcontent,[link widoczny dla zalogowanych], thepHvalue, smallmoleculesalt / acidonitsstability, viscosity, CMC, particlesizes, conductivitywereinvestigated. Inthemeanwhile. itWaScomparedthatditierenceandrelationofthepHcriticalvalueandCMCinPUdispersionswithditierentsoftsegmentmolecularweight. TheresultshowedthatwhilePUcontentWaSraisingitsviscosityWaSenhancing. PUviscositywith30wt% solidcontentWaShighertwentytimesthanPUviscositywith20wt% solidcontent. WiththeadditionofsmallmoleculesaltNaC1. electroviscouseffectofPUdispersionsgraduallydisappearedandPUconductivityappearedfluctuating. WithNaCIaddition / molecularweightofsoftsegmentincrease, CMCvalueminished,[link widoczny dla zalogowanych], thecalciumionwaSmoreobviousdestructivefunctiontothediffuseelectricaldoublelayerofPUdispersions. WiththeincreaSingofpHvalue,[link widoczny dla zalogowanych], PUparticlesizesgraduallydecreaSedbutconductivityincreaSinglyrose. WiththeincreaSingofmolecularweightofsoftsegment, PUviscosityWaSgoingup, pHcriticalvalueincreaSed. PUsystemWaSofbuffereffectonadscititiousacid. Keywords: Containingionsinsoftsegment; Aqueouspolyurethane; Viscosity; Conductivity; Thecriticalvalue.
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