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Rubber/Graphene Oxide Composites :Interfacial Interaction and Performances  
Rubber/Graphene Oxide Composites :Interfacial Interaction and Performances
資料類型： PDF文件
關(guān)鍵詞： Rubber  Graphene  oxide  Interfacial  adhesion  Dielectric  relaxation  
spectra  
資料大小： 100K
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(jiǎn)介：
Inpolymercomposites,theinterfacialinteractionbetweenpolymermatrixandfillersisakeyfactorthatgovernsthepropertiesofthefinalcomposites.Inpresentwork,theelastomericcompositesconsistingofgrapheneoxide(GO)sheetsandbutadiene-styrene-vinylpyridinerubber(VPR)werepreparedbyco-coagulationprocesswithdifferentflocculants,hydrogenchlorideandcalciumchloride,inordertoformtwokindsofbondinginterfaces,namelyionicbonding(HVPR)andhydrogenbondinginterfaces(CaVPR).Theinterfacialinteractions(hydrogenbondingandionicinterfacialbonding)werecharacterizedbyXPSandUVspectra.Comparisonoftheeffectsoftheinterfacialinteractiononthepropertiesofthecompositeswasconducted.ItshowedthatthemechanicalpropertiesandgaspermeabilityofHVPR/GOcompositeswereobviouslysuperiortothoseofthecompositeswithhydrogenbondinginterface.Withionicinterfacialbonding,inclusionof3.6vol%ofGOinVPRgenerated21-foldincreaseinglassymodulus,7.5-foldincreaseinrubberymodulus,and3.5-foldincreaseintensilestrength.TheveryfinedispersionofGOandthestrongionicinterfaceinthehybridswereresponsibleforsuchunprecedentedreinforcingefficiencyofGOtowardsVPR.Torevealtheeffectsofinterfacialinteractiononthemoleculardynamics,thedielectricrelaxationspectraofthecompositeshavebeeninvestigated.Resultsshowedthatboththecompositesexhibitedtwodistinctrelaxationprocesses,segmentalrelaxationandinterfacialrelaxation.ConcentrationofGOhadnoimpactonthesegmentaldynamicsofCaVPR,whereas,thesegmentaldynamicsofHVPRsloweddownwhenGOcontentwasabovel.5vol%.Meanwhile,thesegmentalrelaxationofHVPRwasalwaysalittlefasterthanitsCaVPRcounterpart.Inthetemperaturerangeof5一350C,anewrelaxationmode,whichwasslowerthanthesegmentalrelaxationandattributedtotheinterphasewithrestrictedchaindynamics,wasobservedforallthecompositeswithGOloadinglowerthan2.5vol%.TheinterfacialrelaxationtimeofHVPRcontinuouslydecreasedwiththeGOconcentration.However,itdecreasedfirstthenincreasedforCaVPR.Mostinteresting,theinterfacialrelaxationofHVPRwasslowerthanthatforCaVPR.Thee9andthecalculatedfragilityparameterandeffectiveactivationenthalpyoftheinterfacialchainsinHVPRwerealwayshigherthanthoseinCaVPRwiththesameGOconcentration.A11theevidencesindicatedstrongerinterfacialinteractioninHVPRthaninCaVPR.
作者： Z. H. Tang, S. W. Wu, B. C. Guo , L. Q. Zhang
上傳時(shí)間： 2013-07-01 16:05:21
下載次數(shù)： 1
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