Properties of PLA/PBS in-situ Reinforced Blends Prepared by Vane Extruder-中国聚合物网,论文下载

Properties of PLA/PBS in-situ Reinforced Blends Prepared by Vane Extruder

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PLA PBS In-situ reinforced blends Vane extruder

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通用高分子材料

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Withtheresearchanddevelopmentofhighperformancepolymermaterials,theproblemsofresources9environmentandenergymustbeconsideredinordertorealizesustainabledevelopmentofpolymerindustry.Therefore,itisadevelopmenttrendtoexploitanovelhighperformancebiodegradablepolymerfromrenewableresources.Anewblendingmethodhasbeenconcernedinrecentresearchanddevelopmentefforts,whichisemployedtogeneratesomedeformeddispersedphaseinsituduringbiodegradablepolymerblendingprocessingwithphysicalandchemicalmeansorexternalfieldchange.Itiswellprovedthatthedeformedmorphologyismoreeasilyrealizedinelongationalforcefieldinwhichthevelocitygradientisparallelwiththeconveyingdirection.Inordertoachievetheprocessbasedontheelongationalforcefield,QU[l‘2]designedapolymerprocessingequipmentdesignatedasvaneextruderinwhichthepolymerparticulatesareplasticizedandconveyedbynormalstress.Thevolumeelongationalforcefieldcanbegeneratedbyperiodicallychangingofthecavityvolumeinthevaneplasticatingandconveyingunits(VPCUs).ThroughthecontinuousmotionofthepolymermaterialsintheadjacentVPCUs,itcangenerateacontinuousvolumeelongationalforcefieldinthepolymerplasticatingandconveyingprocess.Inthisstudy,avaneextruderisemployedtopreparePoly(lacticacid)/Poly(butylenesuccinate)trulybiodegradablein-situreinforcedblendsunderdifferentprocessingparameters(temperatureandtimes)andthemorphologies,thermalpropertiesandmechanicalpropertiesofblendspreparedareanalyzed.MorphologicalobservationindicatedthatwithincreasingtheprocessingtimesthePLAparticlesizeofblendsbecamesmallerandtheshapeofthefracturesurfaceofPLAshowedovalshapeandlongstripundergoinglowtemperatureprocessing.TGAthermogramsshowedthattheorientedPLAdispersedwellinthematrixofPBSretardedtheflame.MechanicalstudiesrevealedthePLA/PBSblendsoflowtemperatureprocessingexhibitedoptimumelongationatbreakaswellastensilemodulus,tensilestrengthandimpactstrength,whichimpliesthatthein-situreinforcementofblendsisrealizedduringprocess.

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liu

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2013-06-21 14:57:38

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