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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(guān)鍵詞： pla  natural  fiber  renewable  biocomposites  morphology  performance  
資料大小： 111K
所屬學(xué)科： 分子表征
來源： 第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集（2013.6.2-6 武漢）
簡(jiǎn)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(shí)間： 2013-07-02 13:39:42
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