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Rubber/Graphene Oxide Composites :Interfacial Interaction and Performances

資料類型：

PDF文件

關鍵詞：

Rubber Graphene oxide Interfacial adhesion Dielectric relaxation
spectra

資料大小：

100K

所屬學科：

分子表征

來源：

第六屆亞歐研討會上處理和性能增強聚合物會議文集（2013.6.2-6 武漢）

簡介：

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

上傳時間：

2013-07-01 16:05:21

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