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、vouldresult1nthesizedependenceoftheviscosity,wal

2、lslip，andthee毹Ctofsu嘞cetenslon1ncreaseintheflowchannel．MaterialexperiencedmorecomplicatedmechanicshistoryandthermalhistoryexperiencedcomparedwitIl仃aditional1IlJectionmolding,thesespecialbehaviorwillaffectthecrystallizationofthepolyIneratdifferentstages·Inaddition，thecharacterizationofthemorpho

3、lo西cals臼n】cturealsoexistscertaindifficultiesduetothesizeofmicro．injectionmoldedpartsisv哪small·Therefore,thereisanurgentneedtostudythem唧hologYofthem1Cro。1nJeCtlctonmoldedpartstocontrolthemorphologyofmicroproducts，impmvetheperformanceofmicro-products．ThepaperworkandreleⅥmtconclusions锄．easfollows

4、：l·Analysisofmoldingabilityandflowphenomenaofmicropansinmicro1njectlonmolding·Basedonthemicro—injectionmoldingexperimentsofasetofmlcmthmwallpartswiththicknessof100I．tm，200I．tm，500岬锄dlmm，the1nnuenceoftheprocessparametersonthemoldingabilityofthepanswitIldi疏rerltm1Cknesseswereinvestigated．Theproc

5、essoperationwindowsofthepartswithm蜘tthicknesswereobtained，andthemechanismofflowiInbalancephenomeIla姐dtheVariationoftheshapeofmeltflowfrontinmoldingprocesswereaIlalvzed．The心sultshowedthatthecavityfillingrateincreasedastheinjectionspeed，moldtemperatu托andmelttemperatureincreased，theinfluenceofthe

6、processparameterSonmoldfillingfrombigtosmallinturnwastheinjectionspeed，moldtemperature，melttemperature·Itismoredifficulttoachievethefillingcompletelvwiththedecrea∞ofproductthickness，andtheprocessoperatingwindowwillben町owed．fheprocesswindowanalysisshowedthatthemoldtemperatureandinjectionspeedf1

7、．1-ecloselyrelated．‘2·comp撇tlveanalysisofthetypicalmorphologyofthemicroinjectionparts．ABSTRACTBymeallsofpolarizedlightmicroscopy(FLM)andwideangleX-raydiffractionfWAXD)，theinfluenceofinjectionspeed，melttemperatureandmoldt锄p舳onthemorpholo