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【英文标准名称】:StandardTestMethodforPlastics:DynamicMechanicalProperties:CureBehavior
【原文标准名称】:塑料的标准试验方法:动力机械性能:固化特性
【标准号】:ASTMD4473-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:behavior;curebehavior;flow;rheological;thermosettingresins;viscosity;Curingcharacteristics--plastics;Dynamicmechanicalanalysis(DMA);Geltime;Mechanicalproperties--plastics;Modulusofelasticity--plastics;Nonresonantvibratorydata;
【摘要】:Thistestmethodprovidesasimplemeansofcharacterizingthecurebehaviorofthermosettingresinsusingverysmallamountsofmaterial(fewerthan3to5g).Thedataobtainedmaybeusedforqualitycontrol,researchanddevelopment,andestablishmentofoptimumprocessingconditions.Dynamicmechanicaltestingprovidesasensitivemethodfordeterminingcurecharacteristicsbymeasuringtheelasticandlossmoduliasafunctionoftemperatureortime,orboth.Plotsofcurebehaviorandtandeltaofamaterialversustimeprovidegraphicalrepresentationindicativeofcurebehaviorunderaspecifiedtime-temperatureprofile.Thistestmethodcanbeusedtoassessthefollowing:Curebehavior,includingrateofcure,gel,andcuretime.Processingbehavior,aswellaschangesasafunctionoftime/temperature.Note38212;Thepresenceofthesubstratepreventsanabsolutemeasure,butallowsrelativemeasuresofflowbehaviorduringcure.Theeffectsofprocessingtreatment.Relativeresinbehavioralproperties,includingcurebehavioranddamping.Theeffectsofsubstratetypesoncure.Note48212;Duetotherigidityofasupportingbraid,thegeltimeobtainedfromdynamicmechanicaltraceswillbelongerthanactualgeltimeoftheunsupportedresinmeasuredatthesamefrequency.Thisdifferencewillbegreaterforcompositeshavinggreatersupport-to-polymerrigidityratios.Effectsofformulationadditivesthatmightaffectprocessabilityorperformance.Formanymaterials,theremaybeaspecificationthatrequirestheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1ofClassificationSystemD4000liststheASTMmaterialsstandardsthatcurrentlyexist.1.1Thistestmethodcoverstheuseofdynamic-mechanical-oscillationinstrumentationforgatheringandreportingthethermaladvancementofcurebehaviorofthermosettingresin.Itmaybeusedfordeterminingthecurepropertiesofbothunsupportedresinsandresinssupportedonsubstratessubjectedtovariousoscillatorydeformations.1.2Thistestmethodisintendedtoprovideameansfordeterminingthecurebehaviorofsupportedandunsupportedthermosettingresinsoverarangeoftemperaturesbyfreevibrationaswellasresonantandnonresonantforced-vibrationtechniques,inaccordancewithPracticeD4065.Plotsofmodulus,tandelta,anddampingindexasafunctionoftime/temperatureareindicativeofthethermaladvancementorcurecharacteristicsofaresin.1.3Thistestmethodisvalidforawiderangeoffrequencies,typicallyfrom0.01to100Hz.However,itisstronglyrecommendedthatlow-frequencytestconditions,generallybelow1.5Hz,beutilizedastheygenerallywillresultinmoredefinitivecure-behaviorinformation.1.4Thistestmethodisintendedforresin/substratecompositesthathaveanuncuredeffectiveelasticmodulusinsheargreaterthan0.5MPa.1.5Apparentdiscrepanciesmayariseinresultsobtainedunderdifferingexperimentalconditions.Theseapparentdifferencesfromresultsobservedinanotherstudycanusuallybereconciled,withoutchangingtheobserveddata,byreportinginfull(asdescribedinthistestmethod)theconditionsunderwhichthedatawereobtained.1.6Duetopossibleinstrumentationcompliance,especiallyinthecompressivemode,thedatageneratedmayindicaterelativeandnotnecessarilyabsolutepropertyvalues.1.7Testdataobtainedbythistestmethodarerelevantandappropriateforuseinengi......
【中国标准分类号】:G31
【国际标准分类号】:83_080_10
【页数】:5P.;A4
【正文语种】:英语