The Crystalline Superstructure of Polylactide ( PLA) and PLA/ramie Fiber Bio-composites under Strong Shear Flow-中国聚合物网,论文下载

The Crystalline Superstructure of Polylactide ( PLA) and PLA/ramie Fiber Bio-composites under Strong Shear Flow

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Polylactide Shish-kebabs Transcrystallinity Hybrid shish-kebab Ramie fibe

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通用高分子材料

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Theflow-inducedshish-kebabsofpolyolefinshavebeenwelldemonstratedtobehighlybeneficialtomechanicalstrength,toughness,heatresistance,gasbarrier,etc.However,itisstillachallengetoachievenumerousshish-kebabsofbiodegradablepoly(L-lacticacid)(PLLA)duetoitsshortchainlengthandsemi-rigidchainbackbonecomparedtopolyolefinscl].Inthiswork,anovelinjectionmoldingtechnology,namedoscillationshearinjectionmolding(OSIM),wasappliedtoprovideanintenseshearflowonPLLAmeltincavity,inordertoaccelerateshear-inducedcrystallizationofPLLAininjectionmoldedPLLAandPLLA/ramiefiberbio-composites.Numerousofshish-kebabsofPLLAhavebeensuccessfullyachievedininjection-moldedPLLAforthefirsttime[2],andhighresolutionscanningelectronmicroscopyrevealsadiameterofaround0.7ymandalongperiodof一20nmfortheshish-kebabsuperstructure.Moreinterestingly,besidestheformationofclassicshish-kebabs,shearflow-driventranscrystallinity(TC)onramiefibersurfaceandhybridshish-kebabsuperstructureinducedbyramienanofibersweredirectlyachievedinPLLA/ramiefiberbiocompositesbyusingOSIM.Therelationshipbetweenthesenovelsuperstructuresandmechanicalpropertieswasalsoinvestigated.Theresultsshowthatamoderateimprovementofthemechanicalpropertiessuchasthetensilestrengthandstiffnesscanbeobtainedduetothepresenceofshishkebabs.Moreintriguingly,withtheexistenceofTC,hybridshish-kebabsandramiefibers,anoteworthypromotionintensilestrength,stiffnesstensilemodulusandNotchedimpactstrengthisachievedinthebiocomposites,obtainingsubstantialincreaseof一22%,～41%and～120%comparedtotheneatPLLAsamplemoldedbyconventionalinjectionmolding,respectively.Itisbelievedthatfurtherexplorationwillprovidearichfundamentalunderstandingintheshear-inducedcrystallizationandmorphologymanipulationofPLLA,aimingtoachievesuperiorPLLAproductsininjectionmoldingprocess.

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2013-06-28 17:13:47

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