搜索:  
Rheology of Sub-micron Thick Polymer Melt  
Rheology of Sub-micron Thick Polymer Melt
资料类型: PDF文件
关键词: thin-film  theology  fluorescence  
资料大小: 102K
所属学科: 分子表征
来源: 第六届亚欧研讨会上处理和性能增强聚合物会议文集(2013.6.2-6 武汉)
简介:
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
上传时间: 2013-06-27 11:27:24
下载次数: 1
消耗积分: 2  
立即下载:
1人
1人
1人
友情提示:下载后对该资源进行评论,即可奖励2分。
报告错误:  1.下载无效  2. 资料明显无价值  3. 资料重复存在

相关评论 共有0人发表评论 更多评论
你还没有登录,无法发表评论,请首先 登录 注册
免责声明:本站部分资源由网友推荐,来自互联网,版权属于原版权人,如果不慎侵犯到您的权利,敬请告知,我们会在第一时间撤除。本站中各网友的评论只代表其个人观点,不代表本站同意其观点。