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聚乳酸碳纳米管复合物结晶性能的研究.docx

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聚乳酸碳纳米管复合物结晶性能的研究 摘要 本文研究了聚乳酸（PLA）碳纳米管（CNT）复合物的结晶性能。采用扫描电子显微镜（SEM）、X射线衍射仪（XRD）和差示扫描量热仪（DSC）对复合物样品进行表征和分析。结果表明，CNT的加入提高了PLA复合物的晶化程度和熔融温度，且复合物中的PLA晶体结构更为完整。此外，不同CNT含量对复合物的结晶行为和热稳定性有着不同的影响。 关键词：聚乳酸，碳纳米管，复合材料，结晶性能，热稳定性 Abstract Thispaperstudiedthecrystallizationpropertiesofpoly(lacticacid)(PLA)carbonnanotube(CNT)composites.Thesampleswerecharacterizedandanalyzedbyscanningelectronmicroscope(SEM),X-raydiffraction(XRD)anddifferentialscanningcalorimeter(DSC).TheresultsshowedthattheadditionofCNTimprovedthecrystallizationdegreeandmeltingtemperatureofPLAcomposites,andthecrystalstructureofPLAinthecompositewasmorecomplete.Moreover,differentCNTcontentshaddifferenteffectsonthecrystallizationbehaviorandthermalstabilityofthecomposites. Keywords:poly(lacticacid),carbonnanotubes,compositematerials,crystallizationproperties,thermalstability Introduction PLAisabiodegradableandrenewablepolymerwithexcellentmechanicalandphysicalproperties,andhasbeenwidelyusedinvariousfields.However,theinherentbrittleness,lowthermalstabilityandpoorprocessabilityofPLAlimititsfurtherapplications.CNTs,asakindofhigh-strengthandhigh-conductivitynanomaterial,havebeenwidelyusedincompositematerialstoimprovethemechanical,physicalandthermalpropertiesofthematerials.Inrecentyears,manystudieshavefocusedonthepreparationandcharacterizationofPLA-CNTcomposites,anddiscovereditspotentialapplicationsinvariousfields. ThecrystallizationofPLAisacomplexprocess,whichisrelatedtothemolecularstructureofthepolymer,processingconditionsandadditives.TheadditionofCNTscanaffectthecrystallizationbehaviorofPLA,andthemechanismisstillunderinvestigation.Therefore,inthisstudy,theeffectofCNTsonthecrystallizationbehaviorandthermalstabilityofPLAcompositeswasinvestigatedbySEM,XRDandDSCmethods,aimingtoprovideatheoreticalbasisforthepreparationofhigh-performancePLA-CNTcomposites. MaterialandMethods Materials PLA(IngoPLA20506)andmulti-walledcarbonnanotubes(CNTs,ChengduOrganicChemicalCo.,Ltd.)wereusedinthisstudy.ThePLAhadamolecularweightof206,000g/molandad