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Rheology of Sub-micron Thick Polymer Melt  
Rheology of Sub-micron Thick Polymer Melt
資料類型: PDF文件
關鍵詞: thin-film  theology  fluorescence  
資料大小: 102K
所屬學科: 分子表征
來源: 第六屆亞歐研討會上處理和性能增強聚合物會議文集(2013.6.2-6 武漢)
簡介:
Polymericnanocomposites(PNCs)haveattractedalotofattentionduetoitspotentialsinsuperiormechanicalproperties,conductivity,gaspermeability,tonameafew,thatverymuchsurpasswhatconventionalpolymercompositescanprovide.ThesuccessofPNCsrequiresagooddispersionofthereinforcementphaseinthepolymermatrix.Inthesewell-dispersedPNCs,sub-micron,orevennanometersthickpolymerisconfinedbetweenreinforcementphases.UnderstandingthedynamicsofsuchthinpolymermeltsconfinedbetweentworubbingsurfacescanhenceprovideimportantinsightonboththedispersionmechanismsandprocessingofPNCs.Yetlittleworkonthedirectmeasurementofthetheologyofthinpolymermeltshasbeenperformedasthenanoscopicfilmthicknessbarstheuseofconventionaltechniques.Recentlytheauthorshavesuccessfullyappliedphotobleached-fluorescenceimagingtoobtainthefirstexperimentthroughthicknessflowprofileofa100nmpolymerfilmconfinedbetweentworubbingsurfacescl].Basedonthetechniquedeveloped,theobjectiveofthispresentationistodiscusstheeffectofshearrateonthetheologyofthinpolymerfilm.Polybutene(PB)wasusedasthemodelpolymer.PBshowsmultipleflowphenomena.ItdoesnotfollowthepredictedCouetteflowandoftenassumedforNewtonianliquid.Twodistinctflowconditionswereobserved:transitionfromCouetteflowtoanon-linearvelocityprofile;andshearbanding.Interfacialslipswerealsoquantified.Causesofnon-linearprofilesarefurtherinvestigatedwithcomputationalsimulations.Preliminaryresultsshowthatalinearprofileistheonlypossiblesolutionforaconstantstresslayereveninpresenceofapowerlaw.Afunctionaldependenceofthefluidviscosityonthedistancefromthewall,inparticular,theviscosityofthefluidtoincreaseatleastlinearlyawayfromthewallwasnecessaryfortheobservedphenomena.Thisbehaviorisexplainedatamicroscopiclevelbyconsiderationsonthemobilityoflongmoleculesnearawall.
作者: A.Ponjavic, L.di Mare, J.S.Wong
上傳時間: 2013-06-27 11:27:24
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