等规聚丙烯微注塑制品可成型性及形态结构的-研究

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1、ABSTRACT———————————————————————————————————一Themeltinthemicroinjectionmoldingprocessexhibitdi丘旨entprocessingcharacteristicscomparedwiththeconventionalinjectionmolding,andmoldedbvthemgIltemperature，highpressureandhighshearinthemicro．cavity,w11iCh、vouldresult1nthesizedependence

2、oftheviscosity,wallslip，andthee毹Ctofsu嘞cetenslon1ncreaseintheflowchannel．MaterialexperiencedmorecomplicatedmechanicshistoryandthermalhistoryexperiencedcomparedwitIl仃aditional1IlJectionmolding,thesespecialbehaviorwillaffectthecrystallizationofthepolyIneratdifferentstages·Inadd

3、ition，thecharacterizationofthemorpholo西cals臼n】cturealsoexistscertaindifficultiesduetothesizeofmicro．injectionmoldedpartsisv哪small·Therefore,thereisanurgentneedtostudythem唧hologYofthem1Cro。1nJeCtlctonmoldedpartstocontrolthemorphologyofmicroproducts，impmvetheperformanceofmicro-

4、products．ThepaperworkandreleⅥmtconclusions锄．easfollows：l·Analysisofmoldingabilityandflowphenomenaofmicropansinmicro1njectlonmolding·Basedonthemicro—injectionmoldingexperimentsofasetofmlcmthmwallpartswiththicknessof100I．tm，200I．tm，500岬锄dlmm，the1nnuenceoftheprocessparametersont

5、hemoldingabilityofthepanswitIldi疏rerltm1Cknesseswereinvestigated．Theprocessoperationwindowsofthepartswithm蜘tthicknesswereobtained，andthemechanismofflowiInbalancephenomeIla姐dtheVariationoftheshapeofmeltflowfrontinmoldingprocesswereaIlalvzed．The心sultshowedthatthecavityfillingra

6、teincreasedastheinjectionspeed，moldtemperatu托andmelttemperatureincreased，theinfluenceoftheprocessparameterSonmoldfillingfrombigtosmallinturnwastheinjectionspeed，moldtemperature，melttemperature·Itismoredifficulttoachievethefillingcompletelvwiththedecrea∞ofproductthickness，andt

7、heprocessoperatingwindowwillben町owed．fheprocesswindowanalysisshowedthatthemoldtemperatureandinjectionspeedf1．1-ecloselyrelated．‘2·comp撇tlveanalysisofthetypicalmorphologyofthemicroinjectionparts．ABSTRACTBymeallsofpolarizedlightmicroscopy(FLM)andwideangleX-raydiffractionfWAXD)，

8、theinfluenceofinjectionspeed，melttemperatureandmoldt锄p舳onthemorpholo