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Flow-induced Morphologies of Poly(lactic acid) and Ramie Fibers in Injection-molded Biocomposites  
Flow-induced Morphologies of Poly(lactic acid) and Ramie Fibers in Injection-molded Biocomposites
資料類型: PDF文件
關鍵詞: pla  natural  fiber  renewable  biocomposites  morphology  performance  
資料大?。?/td> 111K
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:
Thepoly(lacticacid)(PLA)/ramiefiberbiocompositeswerefabricatedbyextrusioncompoundingfollowedbyinjectionmolding,andfurtherattemptsweremadetounderstandtheflow-inducedmorphologyoframiefibersandPLAcrystalsintheinjection-moldedPLA/ramiefiberbiocomposites,thusrevealingitsrelationshipwithbiocompositemechanicalproperties.Thepolarizedopticalmicroscopy(POM)andtwo-dimensionalwide-angleX-raydiffraction(2D-WAXD)wereforthefirsttimeusedtodeterminethedistributionofnaturefibers,whichinterestinglyshowedtheramiefibersalignedwellalongtheflowdirectionoverthewholethicknessofinjection-moldedparts,insteadofskin-corestructure.ThiseasyalignmentoframiefibersduringthecommonprocessingwasascribedtotheintrinsicallyhighflexibilityoframiefibersandstronginterfacialinteractionbetweenPLAchainsandcellulosemoleculesoframiefibers.Both2D-WAXDanddifferentialscanningcalorimeter(DSC)measurementssuggestedthatthePLAmatrixinitsramiebiocompositespresentedhigherorientationdegreeandcrystallinity,whichwasattributedtoeffectiveheterogeneousnucleationinducedbyramiefibersandlocalshearingfieldinthevicinityoffibersurface.Remarkableimprovementofmechanicalandthermo-mechanicalpropertieswasachievedforPLA/ramiefiberbiocomposites,withoutsacrificeoftoughnessandductility.Additionof30wt%ramiefibersincreasedthetensilestrengthandmodulusofPLA/ramiefiberbiocompositesfrom65.6and1468MPaforpurePLAt091.3and2977MPa,respectively.Thesesuperiormechanicalpropertieswereprimarilyattributedtoeasyalignmentoframiefibers,highcrystallinityofPLA,andfavorableinterfacialadhesionasrevealedbyscanningelectronmicroscopy(SEM)observationandtheoreticalanalysisbasedondynamicmechanicalanalysis(DMA)data.
作者: H. Xu, Y. Li, H. D. Huang, J. Zhang, G. J. Zhong
上傳時間: 2013-07-02 13:39:42
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