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Thermal Processing and Glass Transition Behavior of Cellulose Plasticized by Ionic Liquids

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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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