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Response in Melt Viscosity of Polystyrene with Different Topological Structure after Adding Isotropic Nanoparticles  
Response in Melt Viscosity of Polystyrene with Different Topological Structure after Adding Isotropic Nanoparticles
資料類型: PDF文件
關(guān)鍵詞: nanoparticles  rheology  polystyrene  star  polymer  
資料大?。?/td> 105K
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:
Polymernanocompositesfabricatedbydispersingnanoparticlesinpolymermatriceshavethepotentialforperformancethatfarexceedstraditionalcomposites.Recently,theadditionofisotropicnanoparticletolinearpolymersledtonegativeviscositychange,suchasC600rFe304inpolystyrene(PS)cl],polysilicatesinPDMSc2]andpolyhedraloligosilsesquioxane(POSS)inHDPEc3]etal.Onsummarizingthedatareported,therearethreeconditionstobesatisfied:i)Particlesbeingsmallerthatthetuberadiusforthepolymer;ii)Thepolymerbeingabovetheentanglementmolecularweight;iii)Theparticlespacingbeingontheorderofthepolymerradiusofgyration.Inthiswork,theologicalbehaviourofthree-armandsix-armstarpolystyrene(SPS)withasmallamountofC600rPOSSwasstudied.Boththelinearoscillationfrequencysweep(linear)andsteadyshearnonlineartheologyofSPSnanocompositesshoweddecreasedviscosityintheunentangledSPSmatrix,butreinforcementintheentangledSPSmatrix.Inparticular,whenmolecularweightofthearm(Ma)ofSPSwassmallerthanthecriticalmolecularweightforentanglement(Mc)ofPS,thezeroshearviscosity(770)ofSPSnanocompositeswithlowcontentofnanoparticleswaslowerthanthatofpureSPS.TheseresultswerecontrarytothepreviousworkaboutthemeltviscositybehavioroflinearPS(LPS)/C60composites[l].ThepossiblemechanismbehindthemeltviscositybehaviorofSPSnanocompositeswasdiscussed.
作者: H. Y. Tan, D. H. Xu , J. 2heng, D. Wad , T. Tang
上傳時(shí)間: 2013-06-26 14:16:10
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