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Linear Viscoelasticity of Filled Polymer Melts

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關(guān)鍵詞：

Linear wscoelasticity Filled polymer melts Time-temperature-concentration superposition

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181K

所屬學(xué)科：

通用高分子材料

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簡(jiǎn)介：

Filledpolymersexhibitadiverserangeoftheologyvaryingfromsimpleviscousfluidstohighlyelasticsolidswithincreasingfillervolumefraction,9.Theeffectoffillingontheologyiswell-knownintherangeofsmall9wherethereinforcementcouldbeattributedtohydrodynamiceffectscausedbythesolidinclusionsinthemeltstream.Forhigh9wheredirectparticlecontactsdominatethedeformation,astraightforwardsolutionofhydrodynamicequationsisdifficultandtheoreticalmodelsbasedontherealisticstructuralideasarestillmissingsofar.Thetransitionliquid-liketosolid-likeatthelow-frequency(co)zonehasbeenascribedtotheslowdownofchainrelaxationduetopolymeradsorptiononthesurfaceofparticles,thelong-livedchainbridgesbetweentheparticles,thejammednetworkofinteractingparticlesatlowandintermediate9,orthecolloidalandfrictionalinteractionsaswellasbreakdownoflubricatedindirectcontactsbetweenparticlesat9highenough.Wewillshow,however,theso-calledliquid-likeandsolid-likebehaviorssharethecommonmechanism,intheframeworkofaproposed"twophasemodel"appliedtolineardynamictheologyofpolymermeltsfilledwithawiderangeofnanosizedfillers.Atime-concentrationsuperposition(TCS)principlehasbeenappliedtoweaklyattractingcolloidsuspensionsatcontroversyforabout30years.Faitel,sonandYakobsoncl]CreatedTCSprincipleindynamictheologyofliquid-likechalkdispersionsusingamodulusshiftfactoraGdefinedas"strainamplificationfactor".ApplicabilityofthisTCSprinciplec2-4]suggeststhatthefillerphasedoesnotintroduceanychangesindynamicsofthedispersant,atleastat9belowapercolationthreshold體inthehigh-cozone.However,thisTCSprinciplebreaksdowninthelow-cozonewherethecontributionfromtheparticlenetworkseemsdominative.TrappeandWeitzc5]demonstratedanotherTCSprincipleindynamictheologyofsolid-likeCBdispersions(φ>φc。),byintroducingtwoindependentscalingfactorsforbothmodulusandfrequency,aGandam,whichisfurthervalidatedinseveraldispersionsandpolymercomposites[6-13].MoleculardynamicsimulationonanidealizednanofilledelastomerrevealstheTCSprincipletoterminalrelaxationonthechainlengthscalecl4]whilethisprinciplebreaksdownatthesegmentallengthscale.

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liu

上傳時(shí)間：

2013-06-28 13:58:26

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