王十庆-高分子流变学introductiontopolymerrheology

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1、IntroductiontoPolymerRheologyShi-QingWangDepartmentofPolymerScience,UniversityofAkron,Ohio44325IntroductionThemissionsofpolymerrheologyphenomenological(Maxwelllevel),linearviscoelasticitya)characterizationtoolsstructural(molecularlevel),i.e.,molecularweight,MWD,chainarchitecture(branching

2、,functionalmoieties),thusheavilymodeldependentandtheoreticallyintensivenonlinearaspectsb)asub-fieldofpolymersciencefluidmechanicsofpolymers–numericallyintensiveprocessingbehaviori.Fluiddynamics/mechanics-studyflowbehaviorofsimple(Newtonian)fluidsincomplexgeometriesandcomplexflowconditions

3、includingturbulentflowandthermalconvection.ii.Polymerrheology-exploreflowbehaviorofpolymeric(viscoelastic/non-Newtonian)fluidsinsimplegeometries.iii.Fluidmechanicsofpolymers(relevanttoprocessing)-investigateflowbehaviorofviscoelasticpolymericliquidsincomplexgeometriesPARTARHEOLOGYASCHARAC

4、TERIZATIONMETHODSI.Phenomenologicallinearviscoelasticity1.Mechanicaldeformationsa.Stepstrainb.Startupflowc.Smallamplitudeoscillatoryshear(SAOS)2.Linearresponsesa.ElasticHookeansolidsb.ViscousNewtonianliquidsc.ViscoelasticMaxellianresponses3.Classicalrubberelasticity4III.RheometryShear-Aco

5、mbinationofextensionandrotation1.Flowduetoboundarydisplacementa.Lineardisplacementi.Slidingparallelplatesii.Co-cylinderpistonb.Rotationalmotioni.Paralleldisksii.Cone-plateiii.Couette2.Flowdrivenbypressurea.Capillarydieb.ChannelslitExtension1.Instrontypestretcher2.ExtenderatfixedlengthPART

6、BRHEOLOGYASSCIENCEIV.Phenomenologicalaccounts1.Shearthinning2.Strainsoftening3.Wavedistortion4.Extrudateswell5.MeltfractureV.Homogeneousflow1.Basicprincipleforrheometry2.Equivalencebetweencontrolled-rateandcontrolled-stressshear3.Flowhomogeneityindiffusionlimit–terminalflow4.Non-entangled

7、andweaklyentangledpolymersVI.Wallslip–acaseofinhomogeneousshear41.Spurtandflowoscillatory2.Navier-deGennesextrapolationlengthb3.Stick-sliptransitiona.capillaryflowb.dragflow4.Theoreticalaccountsa.limitofsmallsurfacecoverage-Brochard-deGennestheoryb.saturatedadsorpti