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Linear Viscoelasticity of Filled Polymer Melts  
Linear Viscoelasticity of Filled Polymer Melts
资料类型: PDF文件
关键词: Linear  wscoelasticity  Filled  polymer  melts  Time-temperature-concentration  superposition  
资料大小: 181K
所属学科: 通用高分子材料
来源: 来源网络
简介:
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体inthehigh-cozone.However,thisTCSprinciplebreaksdowninthelow-cozonewherethecontributionfromtheparticlenetworkseemsdominative.TrappeandWeitzc5]demonstratedanotherTCSprincipleindynamictheologyofsolid-likeCBdispersions(φ>φc。),byintroducingtwoindependentscalingfactorsforbothmodulusandfrequency,aGandam,whichisfurthervalidatedinseveraldispersionsandpolymercomposites[6-13].MoleculardynamicsimulationonanidealizednanofilledelastomerrevealstheTCSprincipletoterminalrelaxationonthechainlengthscalecl4]whilethisprinciplebreaksdownatthesegmentallengthscale.
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