Nanofillers Reinforced Bio-based Polyester for Shape Memory Applications，第六届亚欧研讨会上处理和性能增强聚合物会议文集（2013.6.2-6 武汉）-中国聚合物网,论文下载

Nanofillers Reinforced Bio-based Polyester for Shape Memory Applications

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Bio-based polyester Boehmite Vapor grown carbon nanofiber
Graphene Shape memory polymer

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分子表征

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第六届亚欧研讨会上处理和性能增强聚合物会议文集（2013.6.2-6 武汉）

简介：

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

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2013-07-01 16:46:40

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