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Cellulose dissolution at low temperature and novel functional materials

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所屬學(xué)科：

分子表征

來(lái)源：

2009先進(jìn)纖維與聚合物材料國(guó)際學(xué)術(shù)會(huì)議（ICAFPM，10.21-10.24，上海）

簡(jiǎn)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(shí)間：

2010-04-15 14:48:45

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