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Flow-induced Morphologies of Poly(lactic acid) and Ramie Fibers in Injection-molded Biocomposites

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關鍵詞：

pla natural fiber renewable biocomposites morphology performance

資料大?。?/td>

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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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