作者:标准资料网 时间:2024-05-09 21:14:20   浏览:9193   来源:标准资料网

【英文标准名称】:StandardTestMethodforMeltFlowRatesofThermoplasticsbyExtrusionPlastometer
【原文标准名称】:用挤压式塑性计测定热塑塑料的熔体流动速率的标准试验方法
【标准号】:ASTMD1238-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:meltflowrate;meltindex;volumeflowrate;Acrylonitrile-butadiene-styrene(ABS);Extrusionplastometer;Flowandflowrate--thermoplastics;Fluoropolymers;Polycarbonate(PC);Polymers;Thermoplastics
【摘要】:Thistestmethodisparticularlyusefulforqualitycontroltestsonthermoplastics.Thedataproducedbythistestmethodservestoindicatetheuniformityoftheflowrateofthepolymerasmadebyanindividualprocess.Itisnottobeusedasanindicationofuniformityofotherpropertieswithoutvalidcorrelationwithdatafromothertests.Theflowrateobtainedwiththeextrusionplastometerisnotafundamentalpolymerproperty.Itisanempiricallydefinedparametercriticallyinfluencedbythephysicalpropertiesandmolecularstructureofthepolymerandtheconditionsofmeasurement.Therheologicalcharacteristicsofpolymermeltsdependonanumberofvariables.Itispossiblethatthevaluesofthesevariablesoccurringinthistestwilldiffersubstantiallyfromthoseinlarge-scaleprocesses,whichwouldresultindatathatdoesnotcorrelatedirectlywithprocessingbehavior.Measuretheflowrateofamaterialusinganyoftheconditionslistedforthematerialin8.2.Formanymaterials,therearespecificationsthatrequiretheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1inClassificationD4000liststheASTMmaterialsstandardsthatcurrentlyexist.Analternativetestmethodforpoly(vinylchloride)(PVC)compoundsisfoundinD3364.Additionalcharacterizationofamaterialcanbeobtainedifmorethanoneconditionisused.Inthecasethattwoormoreconditionsareemployed,aFlowRateRatio(FRR)isobtainedbydividingtheflowrateatoneconditionbytheflowrateatanothercondition.ProcedureDprovidesonemethodtomeasuremorethanoneconditioninasinglecharge.Frequently,variationsintesttechnique,apparatusgeometry,ortestconditions,whichdefyallbutthemostcarefulscrutiny,exist,causingdiscrepanciesinflowratedeterminations.AtroubleshootingguideisfoundinAppendixX2anditisaresourcetobeusedtoidentifysourcesoftesterror.1.1Thistestmethodcoversthedeterminationoftherateofextrusionofmoltenthermoplasticresinsusinganextrusionplastometer.Afteraspecifiedpreheatingtime,resinisextrudedthroughadiewithaspecifiedlengthandorificediameterunderprescribedconditionsoftemperature,load,andpistonpositioninthebarrel.Fourproceduresaredescribed.Comparableresultshavebeenobtainedbytheseproceduresininterlaboratoryround-robinmeasurementsofseveralmaterialsandaredescribedinSection15.1.2ProcedureAisusedtodeterminethemeltflowrate(MFR)ofathermoplasticmaterial.Theunitsofmeasurearegramsofmaterial/10minutes(g/10min).Itisbasedonthemeasurementofthemassofmaterialthatextrudesfromthedieoveragivenperiodoftime.Itisgenerallyusedformaterialshavingmeltflowratesthatfallbetween0.15and50g/10min(seeNote1).1.3ProcedureBisanautomaticallytimedmeasurementusedtodeterminethemeltflowrate(MFR)aswellasthemeltvolumerate(MVR)ofthermoplasticmaterials.MFRmeasurementsmadewithProcedureBarereporteding/10minutes.MVRmeasurementsarereportedincubiccentimetres/tenminutes(cm3/10min).ProcedureBmeasurementsarebasedonthedeterminationofthevolumeofmaterialextrudedfromthedieoveragivenperiodoftime.Thevolumeisconvertedtoamassmeasurementbymultiplyingtheresultbythemeltdensityvalueforthematerial(seeNote2).ProcedureBisgenerallyusedwithmaterialshavingmeltflowratesfrom0.50to1500g/10min.1.4Pr......
【中国标准分类号】:G32
【国际标准分类号】:83_080_20
【页数】:15P.;A4
【正文语种】:英语