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Thermal Processing and Glass Transition Behavior of Cellulose Plasticized by Ionic Liquids  
Thermal Processing and Glass Transition Behavior of Cellulose Plasticized by Ionic Liquids
資料類(lèi)型: PDF文件
關(guān)鍵詞: Cellulose  Thermal  process  lonic  liquids  Plasticize  
資料大小: 112K
所屬學(xué)科: 分子表征
來(lái)源: 第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集(2013.6.2-6 武漢)
簡(jiǎn)介:
Cellulose,akindofpolysaccharidesproducedbygreenplantsandsomekindsofbacteria,hasplentyofadvantages,suchasrenewability,biocompatibilityandoutstandingmechanicalproperties[l].Duetotheinfluencesofcomplexhydrogenbondsnetworks,amphipathyofrepeatunitsandotherunclearreasons,cellulosecanhardlydissolveincommonsolvents,andalso,notmeltduringheatingtodegradationtemperature,whichmadethisfantasticmaterialverydifficulttoutilize[2].Thediscoveryanddevelopmentofthoseeffectiveenvironmentallyfriendlysolventsystems,suchasionicliquids,NaOH/thiourea/ureaandNMMO.H209bringconsiderableprogressincellulosetextileindustrybywetspinning,andalsomakeitpossibletoproducevarietiesoffunctionalcellulosemembranes,gelsandcomposites[3].Comparingwiththewetprocessing,thermalmoldingismorevaluabletechnique.However,fewsignificantbreakthroughoncellulosethermoprocessingwasreportedtillnow[4].Inthiswork,ionicliquid,BmimCIwasusedasplasticizertoimprovethethermalprocessibilityofcellulose.Plasticizedcellulosefilmswerepreparedwithhotcompoundingandcompressionmolding.Glasstransitionbehavioroftheplasticizedcellulosewasinvestigatedbydifferentialscanningcalorimetry(DSC).Theglasstransitiontemperature(Tg)ofpurecellulose,whichcannotbemeasuredexperimentally,wasestimatedtobe470KbyfittingtheTgvaluesofdifferentsampleswithmodifiedGordon-Taylor/Kelley-Buecheequation.ThedeviationofTgcurvefromtheoreticalcurvewithsinglecrystallinitydegreeindicatedthecellulosecrystalwasdisrupted.TheBmimCIenhancedthemobilityofcellulosechainsegments,resultinginimprovedcalenderabilityandfluidityofcellulose.
作者: J. Wu , X. P. Zhou , X. L. Xie
上傳時(shí)間: 2013-07-04 14:51:54
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