【英文标准名称】:StandardTestMethodforAssignmentoftheDSCProcedureforDeterminingTgofaPolymeroranElastomericCompound
【原文标准名称】:测定聚合物或弹性复合材料的玻璃态转化温度(Tg)用塑料差示扫描量热法(DSC)过程分配的标准试验方法
【标准号】:ASTMD7426-2008
【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】:D11.14
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:differentialscanningcalorimetry(DSC);differentialthermalanalysis(DTA);glasstransition;specificheatcapacity
【摘要】:Differentialscanningcalorimetryprovidesarapidtestmethodfordeterminingchangesinspecificheatcapacityinahomogeneousmaterialordomain.Theglasstransitionismanifestedasastepchangeinspecificheatcapacity.Foramorphousandsemi-crystallinematerialsthedeterminationoftheglasstransitiontemperaturemayleadtoimportantinformationabouttheirthermalhistory,processingconditions,stabilityofphases,andprogressofchemicalreactions.Thistestmethodisusefulforresearch,qualitycontrol,andspecificationacceptance.1.1Thistestmethodcoverstheassignmentoftheglasstransitiontemperatures(Tg)ofmaterialsusingdifferentialscanningcalorimetry.1.2Thistestmethodisapplicabletoamorphousmaterials,includingthermosetsorsemicrystalinematerialscontainingamorphousregions,thatarestableanddonotundergodecompositionorsublimationintheglasstransitionregion.1.3Thenormaloperatingtemperaturerangeisfromx2013;120to500x00B0;C.Thetemperaturerangemaybeextended,dependingupontheinstrumentationused.1.4Computerorelectronic-basedinstruments,techniques,ordatatreatmentequivalenttothistestmethodmayalsobeused.Note18212;Usersofthistestmethodareexpresslyadvisedthatallsuchinstrumentsortechniquesmaynotbeequivalent.Itistheresponsibilityoftheuserofthisstandardtodeterminethenecessaryequivalencypriortouse.1.5ISO11357x2013;2isequivalenttothistestmethod.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:83_080_10
【页数】:4P.;A4
【正文语种】:英语