Polymer Rheology-1

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1、PolymerRheologyPSuntharAbstractThischapterconcernstheflowbehaviourofpolymericliquids.Thisisashortintroductiontothevarietyofbehaviourobservedinthesecomplexfluids.Itisaddressedatthelevelofagraduatestudent,whohashadexposuretobasicfluidmechanics.Thecontentsprovideonlyabroadoverviewandsomesimplephysi

2、calexplanationstoexplainthephenomena.Fordetailedstudyandapplicationstoin-dustrialcontextsthereaderisreferredtomoredetailedtreatisesonthesubject.Thechapterisorganisedintothreemajorsections1PhenomenologyInterestingbehaviourofamaterialisalmostalwaysdescribedbyfirstobservingandextractingthequalita

3、tivefeaturesofthevarietyofphenomenaexhibited.Toanovice,thisistheplacetostart.Somequestionstoaskwouldbe:Whatmakesthisphenomenadifferent?Howtodepictitintermsofasimplemodel?Istherea“law”thatcandescribethebehaviour?Arethereotherphenomenathatobeysimilarlaws?Whatrolehasthisplayedinthestateoftheuniv

4、erse?Canitbeemployedforthebettermentofqualityoflife?Whataretheconsequencesofthisbehaviourtoprocessesthatmanipulateorusethematerial?Someofthesearesimplequestions,answerstowhichmaynotsolveanyurgentandpresentproblem.However,itputsitinalargercontext.Often,whensolvingdifficultproblemsinrheologyusin

5、gadvancedmethodsandtools,onetendstomisssimplelawsexhibitedbythematerialsinreality,knowingwhichmayhelpingettinganintuitivefeelofthesolution,andtherebyafasterapproachtotheanswer.DepartmentofChemicalEngineering,IndianInstituteofTechnology(IIT)Bombay,Mumbai400076India.e-mail:p.sunthar@gmail.com12

6、PSunthar1.1WhatarePolymericLiquids?Polymericliquidsarepreciselywhatthenamestates:namelytheyareliketheliquidsweknowthatflowandhaveasconstituents,someorallbeinglongchainmoleculesorpolymers.Theconventionaldefinitionusedtodefinesimpleliquids:thattheydonotsupportshearstressatrest,cannotbeusedtodefinet

7、heliquidstateofapoly-mericliquid.Thisisbecausepolymericliquids,likemostotherliquidsdescribedinthisbookarecomplexfluids:Theyexhibitbothliquidandsolidlikebehaviour,andsomeoftheirdynamicpropertiesmaynotbethermodynamicconstantsbutsomeeffectivecons