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Cellulose dissolution at low temperature and novel functional materials  
Cellulose dissolution at low temperature and novel functional materials
資料類型: PDF文件
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資料大小: 139K
所屬學科: 分子表征
來源: 2009先進纖維與聚合物材料國際學術(shù)會議(ICAFPM,10.21-10.24,上海)
簡介:
Forthefirsttime,wehavedevelopedanovelsolventofcellulose,namely7wt%NaOH12wt%ureaaqueoussolutionpre-cooledto-12oC.CellulosecouldbedissolvedrapidlyintheNaOH/ureaaqueoussolutionwithin2min.Wehaveproposedthatthecellulosedissolutionat-12oCarisesasaresultofafastdynamicself-assemblyprocessamongsolventsmallmolecules(NaOH,ureaandwater)andthecellulosemacromoleculesthroughthehydrogen-bondedarrangementintheaqueoussystematlowtemperature.Fromthecellulosedope,wepreparedsuccessfullyhigh-qualitycellulosemulti-filamentfibersviaapilotmachine,andproventhatthecellulosefibershadacircularcross-sectionalshape(similartoLyocell®)andagoodstructureaswellasmechanicalproperties.Wepreparedmagneticnanocompositefibersbyintroducinginsitusynthesizedironoxide(Fe2O3)nanoparticlesintothewetcellulosefibersspunviaasmall-scalepilotmachine.Moreover,fiber-likeFe2O3macroporousnanomaterialswereobtainedbytheremovalofcellulosematrixbycalcinationsofFe2O3nanoparticlecellulosefibers.Wealsofabricatednovelmagneticcellulosemicrospheres(MRCS)byinsitusynthesiseofFe3O4nanoparticlesintothecelluloseporeasareactionmicro-chamber.TheMRCSmicrospheresexhibitedsensitivelymagnetinducedtransference,extremelysmallhysteresisloop,aswellasgoodadsorptionandreleasecapabilitiesforbovineserumalbumin(BSA).Moreover,wesuccessfullypreparednoveltransparent,fluorescentandlongafter-glowphotoluminescentcellulosefilmsviaagreenprocess,leadingtothepromisingapplication.Thephotoluminescentcellulosefilmscouldabsorblightforseveralminutesandthenemitsavisiblelightformorethan10hinthedark.Wefabricatedsuccessfullyhydrogelshavingstrongfluorescencefromcelluloseandquantumdots(CdSe/ZnSQDs)inNaOH/ureaaqueoussystemviaamildchemicalcross-linkingprocess.Thisworkprovidedanewpathwayfortheconstructingofnovelfunctionalmaterialsvia“Green”process.
作者: ZHANG Lina
上傳時間: 2010-04-15 14:48:45
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