欢迎来到天天文库
浏览记录
ID:52387148
大小:437.05 KB
页数:6页
时间:2020-03-27
《简单剪切对聚合物溶液PSDINP相分离行为的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第22卷第6期化学研究与应用Vo1.22,No.62010年6月ChemicalResearchandApplicationJun.,2010文章编号:1004.1656(2010)06-0721-06简单剪切对聚合物溶液PS/DINP相分离行为的影响程小莲,杨其,罗勇,江耀贵,肖淼,蔡盛梅(~tJfl大学高分子科学与工程学院;四川大学高分子材料与工程国家重点实验室,四川成都610065)摘要:通过剪切.光学显微装置在线研究了聚合物溶液聚苯乙烯(is)/邻苯二甲酸二异壬酯(DINP)体系在静态和简单剪切场下的浊点变化及其相结构的实时演变过程,结果发现在
2、单向剪切场下,当PS/DINP体系中PS含量在15%以下时该体系的剪切浊点基本不随剪切速率的变化而变化;当PS含量在15%以上时该体系的剪切浊点随剪切速率的增大而先增大后减小,并且不同配比下都出现一个最高相界移动,该最高相界移动随着PS含量的增加移向更高的剪切速率。此外,还发现PS/DINP近临界组成的静态相分离过程是典型的粘弹相分离。低剪切速率下的相分离过程与静态下有些相似,初期形成网络结构。并且该结构沿流动方向变形取向,但是网络结构直至实验结束也没有发生破裂,可见低剪切速率对网络结构具有一定的稳定作用。关键词:PS/DINP溶液;简单剪切;切致相分
3、离;粘弹相分离中图分类号:0631.21,TQ050.4+25文献标识码:AEfectofsimpleshearflowonthephaseseparationofPS/DINPsolutionsCHENGXiao—lian,YANGQi’,LUOYong,JIANGYao-gui,XIAOMiao,CAISheng—mei(CollegeofPolymerScienceandEngineering,SichuanUniversity,StateKeyLaboratoryofPolymerMaterialandEngineering,SichuanUn
4、iversity,Cbengdu610065,China)Abstract:Thephase—separationstructureevolutionandthecloudpointschangeofpolystyrene(is)/diisononylphthalate(DINP)solutionswereinvestigatedinquiescentstateandundersimpleshearflowwithanonlineoptics·shearsystem.ItturnedouttobethatwhenthecontentsofPSwereb
5、elow15%(including15%),thecloudpointschangealmostkeptconstantandtheshearcloudpointswereequaltothecloudpointswithoutshearing;whel-ea8thecontentsofPSwereabove15%,thecloudpointschangeinitiallyincreasedwitllshearratesandthendecreased,moreover,theshearcloudpointswerehigherthanthecloud
6、pointswithoutshearing.Besides,thereWasahighestphaseboundaryshiftforeachcomposition,andthehighestphaseboundaryshiftmovedtohighershearrateswhileincreasingIx3content.Besides,itWasfoundthatthephase-separationprocessofnear-criticalPS/DINPsystemWastypicallyviscoelasticphaseseparation.
7、ThephaseseparationofPS/DINPwithlowshearratesundersimpleshearflowWassimilartothephaseseparationinquiescentstate,intheearlystageitalsoleadtotheformationofan‘interactionnetwork’,butthenetworkstructuredeformedandorientedintheflowdirection.Thenetworkdidn’tbreakupeveniftheobservationt
8、imeWasenoughlong.Sowecouldconcludethatlowshearr
此文档下载收益归作者所有