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Structure, Orientation and Melting Behavior of BOPP films  
Structure, Orientation and Melting Behavior of BOPP films
資料類型: JPG圖片格式
關鍵詞: BOPP  film  SAXS  DSC  
資料大小: 166K
所屬學科:
來源: 來源網絡
簡介:
BOPPfilmspreparedwithalaboratoryfilmstretcherKAROIVwerestudiedbySmall-AngleX-rayScattering(SAXS)andDifferentialScanningCalorimetry(DSC).ThestudyshowsthatthecrystalsareorientedinbothMachineDirection(MD)andTransverseDirection(TD)direction.ThecrystalsaremoreorientedinTDdirectionthanMDdirection,duetosubsequentTDstretchingafterinitialstretchinginMD.ThelongperiodinTDdirectionisalsolargerthaninMDdirection.Abroadmeltingpeak(orshoulder)near155oCandasharpmeltingpeakat168oCareobservedfortheBOPPfilm.Thebroadmeltingpeakaround155oCisverylikelycontributedbythecrystalsformedduringMDstretchingandsurvivedthesubsequentTDstretching.Thesurvivedcrystalsarepresumablyfragmented.Infact,abroaderSAXSscatteringpeakisalsoobservedinMDthaninTDdirectionduetothefragmentation.Thesharpmeltingpeakat168oCcanbeattributedtothemeltingofthecrystalsformedduringTDstretchingatahighertemperature,whichusuallyleadstothickerlamellaeandalargerlongperiod.Infact,asignificantlylargerlongperiodisobservedforcrystallamellaeformedduringTDstretching.TheshrinkageofBOPPfilmathightemperatureisveryimportantforsomeofitsapplications.Therefore,theBOPPfilmsannealedatdifferenttemperatureswerealsostudiedwithSAXStoinvestigatetheannealingeffectonthelamellarpackingandorientation.Thepresentstudyshowsthatsignificantchangesinstructureareobservedabove130oC.Thelongperiodincreasessignificantlywithincreaseinannealingtemperature.ThelamellaebecomemoreorientedinTDdirection,possiblyduetothemeltingofthefragmentedcrystals(withlowermeltingpoint)preferablyorientedinMDdirection.
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上傳時間: 2013-11-18 16:16:36
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