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Rheological properties of an associative polymer solution  
Rheological properties of an associative polymer solution
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资料大小: 84K
所属学科: 分子表征
来源: 第四届国际工程塑料研讨会( EP‘2009 8.23-8.26 大连)
简介:
Polymersolutionsformingtransientnetworksshowuniquerheologicalproperties.Specifically,mostofthesystemsundergoshearthickeningathighshearrates.Thetransientnetworksystemsmightbedividedintotwoategories.Oneisthesystemscomposedofpolymerchainsandsmall-sizedcrosslinkers,andtheotherisso-calledassociativepolymersystems.Aqueoussolutionsofpoly(vinylalcohol)(PVA)andsodiumboratebelongtotheformer,andhydrophobicethoxylatedurethanes(HEURs)aretypicalofthelatter,bothofwhichshowshearthickening.Untilnowmuchwork,inexperimentalandtheoreticalapproaches,hasbeenmadetoclarifytheoriginoftheshearthickeninginamicroscopiclevel.Theresultsprovideseveralpossibilitiesfortheshearthickening(forexample,non-Gaussianelasticityofpolymerchains),buttheyarestillincontroversy.Theoriginoftheshearthickeninginthemicroscopiclevelmaybedifferentifthecategorydiffers,butcausesinphenomenologicalrheologymustbecommonforbothcategories.Theaimofthisstudyistoexaminetheoriginoftheshearthickeningofanassociativepolymersystembelongingtothelattercategory:moredirectly,tosurveyexperimentalevidencesforlongtimerelaxationscausingtheshearthickeningunderflow.
作者: Toshikazu Takigawa
上传时间: 2009-12-03 16:24:56
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