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Linear Viscoelasticity of Filled Polymer Melts  
Linear Viscoelasticity of Filled Polymer Melts
資料類型： PDF文件
關(guān)鍵詞： linear  wscoelasticity  filled  polymer  melts  time-temperature-concentration  superposition  
資料大?。?/td> 217K
所屬學(xué)科： 分子表征
來源： 第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集（2013.6.2-6 武漢）
簡介：
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.
作者： Q．Zheng
上傳時(shí)間： 2013-06-28 13:58:26
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