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Nanofillers Reinforced Bio-based Polyester for Shape Memory Applications  
Nanofillers Reinforced Bio-based Polyester for Shape Memory Applications
資料類型： PDF文件
關鍵詞： Bio-based  polyester  Boehmite  Vapor  grown  carbon  nanofiber  
Graphene  Shape  memory  polymer  
資料大小： 114K
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：
Inpresentwork,westudiedtheshapememoryperformancesofbio-basedpolyester(BE)compositeswhichwerereinforcedbythreekindsofnanofillers(boehmite(BM),vaporgrowncarbonnanofiber(VGCF),andVGCF-graphenehybrid).BEwassynthesizedthroughpolycondensationusingtheplant-derivedresourcesasthestartingmaterials.WiththeincorporationofnanofillersintoBE,theBEcompositesweresignificantlyreinforced,meanwhile,fasterbiodegradationrate,electro-activation,andinfrared-actuationpropertiesofthecompositesimpartedbynanofillerswereinvestigated.IntheBE/BMcomposites,strongerandfasterdegradableshapememorypolymers(SMPs)werepreparedwiththeincorporationofBMintoBE.ByvaryingtheBMcontentandcuringagentcontent,thetransformationtemperatureofSMPscompositescouldbetunedtobeclosetobodytemperature.TheinteractionsbetweenBMandBEchain,whichwereessentialforthecompatibilitybetweenthem,werecharacterizedindetail.Thepotentialbiocompatibility,assubstantiatedbytheoutstandingcellviabilityandcellattachment,togetherwiththerealizationoftransformationtemperatureclosetobodytemperaturemaketheBE/BMcompositessuitableforthebiomedicalapplications,suchasstents,inhumanbody.VGCFwereincorporatedintoBEtoprepareBE/VGCFcompositesbysimplemeltingblending.TheuniformdispersionofVGCFandfairlystronginterfacialadhesionbetweenBEandVGCFledtoasignificantimprovementinthemechanicalpropertiesofthecomposites.Besides,theincorporationofVGCFsuccessfullyconvertedtheinsulatingBEintoelectricallyconductivecompositeswithapercolationthresholdof2.5vol%.Thecompositesshowedexcellent，electroactiveshapememoryproperties,whichreachedashaperecoveryratioof97%within90swithadirectcurrentvoltageof20V.VGCF-graphene(VGCF-G)hybridwaspreparedbydirectlyreducinggrapheneoxideintographeneinNMPwiththeassisted-dispersionofVGCF,producingahomogeneousdispersionofVGCF-Ghybrid.OnedimensionalVGCFwereadsorbedontographenesheetsthrough7r-7rinteractionandtherebypreventedtheaggregationandstackingofthegraphene.TheresultingVGCF-GhybridwasthenincorporatedintoBEthroughsolventmixtureinNMP.Forcomparison,BE/VGCFcompositescontainingVGCFalonewerealsopreparedthroughsolventmixture.ThedispersionofVGCFinthecompositesweregreatlyimprovedandtheinterfacialadhesionbetweenBEandVGCFweresignificantlyenhancedwiththeincorporationofgraphenesheetsascompatibilizer.ComparedwiththeBE/VGCFcompositescontainingVGCFalone,aremarkablesynergeticeffectsbetweenVGCFandgrapheneinimprovingtheelectricalconductivityandmechanicalpropertieswereobservedintheBE/VGCF-Gcomposites.Furthermore,themulti-stimuliresponsive(electro-activatedandinfrared-triggered)shapememoryperformancesofthecompositesareinvestigated.Atfixedfillercontent,theBE/VGCF-Gcompositesshowedthecombinationofhighershapememoryrecovery,strongerstressrecoveryandfasterresponsecomparedwiththeircounterpartscontainingVGCFalone.
作者： Z. H. Tang, W. S. Guo, D. Q. Sun, B. C. Guo, L. Q. Zhang
上傳時間： 2013-07-01 16:46:40
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