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 Wysłany: Pi± 23:06, 17 Gru 2010 Temat postu: air jordan shoes cheap Hard elastic polypropylene |
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Hard elastic polypropylene hollow fiber formation
cpolypropylenehollowfiberHUJiwen, HUANGYong2, SHENJiarui2 (1.GuangzhouInstituteofChemistry, ChineseAcademyofSciences,air jordan shoes cheap, Guangzhou510650.China; 2.InstituteofMaterialScienceandEngineering, SouthChinaUniversityofTechnology, Guangzhou510640, China) Abstract: Hardelasticpolypropylenehollowfiberwerepreparedfrompolypropylenemeltcrystallizedunderstressfield. Formation. ofhardelasticityofpolypropylenehollowfiberwerestudied. Theresultsshowedthatthehardelasticpolypropylenehollowfiberswereformedwhenthemeltedpolypropylenewascrystallizedunderhighstress. Theelasticrecoveryofthemraisedwithloweringmeltspinningtemperature,ugg prezzo, highmelt-draftratio, highmolecularweight, andannealing. Theresultsalsoshowedthatthepreparedhollowfibersfollowedtypicalstrain-stresehavior. Keywords: polypropylene; hollowfiber; stressfield; hardelasticity (on the next page No. l6) PrimarystudyonperformanceofsulfonatedpolysulfonemembranesforfuelcellsXINGDanmin, LUFuqiang, yUJingrong, YIBaolian, ZHANGHuamin (FCR & DCenter,ugg boots günstig, DalianInstituteofChemicalPhysics, ChineseAcademyofSciences,ed hardy clothing, Dalian116023,ugg milano, China) Abstract: Inthiswork, thephysico-chemicalandelectrochemicalperformanceofsulfonatedpolysullonewerestudied. Sulfonatedpolysulfonemembr & D_esswelledlassthanNafionmembranesdid. Theprotonconductivitiesinsulfonatedpolysulfonemembr & nesarelowerthaninNation ~ membraneswhenthetwomembraneshavesameEWvalues. Itappearsthatthesulfonatedpolysulfonemembraneslookspromisingforprotonexchangemembranefuelcellapplications. Keywords: sulfonatedpolysulfone; proton ~ exchangemembranes; fuelcell; celiperformance
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