ASTM E1824-2008 使用热机分析测定玻璃转变温度的标准试验方法

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【英文标准名称】:StandardTestMethodforAssignmentofaGlassTransitionTemperatureUsingThermomechanicalAnalysis
【原文标准名称】:使用热机分析测定玻璃转变温度的标准试验方法
【标准号】:ASTME1824-2008
【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】:E37.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:glasstransition;glasstransitiontemperature;Tg;tensilemode;thermomechanicalanalysis(TMA);thermodilatometry;Glasstransition(Tg)temperature;Tensilemode;Thermodilatometry;Thermomechanic
【摘要】:Theglasstransitionisdependentonthethermalhistory,softeningagentsoradditivesofthematerialtobetested.Foramorphousandsemicrystallinematerialstheassignmentofaglasstransitiontemperaturemayleadtoimportantinformationaboutthermalhistory,processingconditions,stability,progressofchemicalreactions,andmechanicalandelectricalbehavior.Thermomechanicalanalysisprovidesarapidmeansofdetectingchangesinhardnessorlineardimensionalchangeassociatedwiththeglasstransition.DimensionalchangesmeasuredasaspecimenisheatedovertheTgregionmayincludetheinteractionofseveraleffects:anincreaseinthecoefficientofexpansion,adecreaseinthemodulus,whichunderaconstantstressleadstoincreasedextension,stressreliefleadingtoirreversibledimensionalchange(shrinkageinonedimension,expansioninanotherdimension),andphysicalagingeffectswhichchangethekineticsofthedimensionalchange.Thistestmethodisusefulforresearchanddevelopment,qualitycontrol,andspecificationacceptancetesting;particularlyoffilmsandfibers.1.1Thistestmethoddescribesaprocedurefortheassignmentofaglasstransitiontemperatureofmaterialsonheatingusingthermomechanicalmeasurementsunderprescribedexperimentalconditions.1.2ThistestmethodmaybeusedasacomplementtoTestMethodE1545andisapplicabletoamorphousortopartiallycrystallinematerialsintheformoffilms,fibers,wires,etc.thataresufficientlyrigidtoinhibitextensionduringloadingatambienttemperature.1.3Thegenerallyapplicabletemperaturerangeforthistestmethodisx2212;100to600x00B0;C.Thistemperaturerangemaybealtereddependingupontheinstrumentationused.1.41.5ThereisnoISOmethodequivalenttothismethod.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q30
【国际标准分类号】:081_040_01
【页数】:4P.;A4
【正文语种】:英语