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The Crystalline Superstructure of Polylactide ( PLA) and PLA/ramie Fiber Bio-composites under Strong Shear Flow  
The Crystalline Superstructure of Polylactide ( PLA) and PLA/ramie Fiber Bio-composites under Strong Shear Flow
資料類型: PDF文件
關鍵詞: Polylactide  Shish-kebabs  Transcrystallinity  Hybrid  shish-kebab  Ramie  fibe  
資料大小: 78K
所屬學科: 通用高分子材料
來源: 來源網(wǎng)絡
簡介:
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.
上傳人: liu
上傳時間: 2013-06-28 17:13:47
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