ASTM E2046-2008 用热分析法测定感应反应时间的标准方法

作者:标准资料网 时间:2024-05-16 14:30:25  浏览:9070   来源:标准资料网

【英文标准名称】:StandardTestMethodforReactionInductionTimebyThermalAnalysis
【原文标准名称】:用热分析法测定感应反应时间的标准方法
【标准号】:ASTME2046-2008
【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】:E27.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:differentialscanningcalorimetry(DSC);differentialthermalanalysis(DTA);hazardpotential;reactioninductiontime(RIT);reactions,thermal;thermalanalysis(TA);thermalstability;Differentialscanningcalorimetry(DSC);Differentialthermalanal
【摘要】:Thistestmethodmeasuresthetimetoextrapolatedonsetofanexothermicreactionunderconstanttemperature(isothermal)conditionsforreactionswhichhaveaninductionperiod,forexample,thosewhicharecatalyticorautocatalyticinnatureorwhichcontainreactioninhibitors.TheRITdeterminedbythistestmethodisanindexmeasurementthatisusefulforcomparingonematerialtoanotheratthetesttemperatureofinterestandinthesameapparatustypeonly.Thistestmethodisausefuladjuncttodynamicthermaltests,suchasTestMethodE537,whichareperformedunderconditionsinwhichthesampletemperatureisincreasedcontinuouslyatconstantrate.Resultsobtainedunderdynamictestconditionsmayresultinhigherestimatesoftemperatureatwhichanexothermicreactioninitiatesbecausethedetectedonsettemperatureisdependentupontheheatingrateandbecausedynamicmethodsallowinsufficienttimeforautocatalyticreactionstomeasurablyaffecttheonsettemperature.RITvaluesdeterminedunderaseriesofisothermaltestconditionsmaybeplottedastheirlogarithmversusthereciprocaloftheabsolutetemperaturetoproduceaplot,theslopeofwhichisproportionaltotheactivationenergyofthereactionasdescribedinTestMethodE2070.Thistestmethodmaybeusedinresearchanddevelopment,manufacturing,processandqualitycontrol,andregulatorycompliance.ThistestmethodissimilartothatforOxidationInductionTime(OIT)(forexample,SpecificationD3350andTestMethodsD3895,D4565,D5483,D6186,andE1858)wherethetimetotheoxidationreactionunderisothermaltestconditionsismeasured.TheOITtestmethodmeasuresthepresenceofantioxidantpackagesandisarelativemeasurementofamaterial''sresistancetooxidation.1.1ThistestmethoddescribesthemeasurementofReactionInductionTime(RIT)ofchemicalmaterialsthatundergoexothermicreactionswithaninductionperiod.Thetechniquesandapparatusdescribedmaybeusedforsolids,liquids,orslurriesofchemicalsubstances.Thetemperaturerangecoveredbythistestmethodistypicallyfromambientto400x00B0;C.Thisrangemaybeextendeddependingupontheapparatusused.1.2TheRITisarelativeindexvalue,notanabsolutethermodynamicproperty.Asanindexvalue,theRITvaluemaychangedependinguponexperimentalconditions.AcomparisonofRITvaluesmaybemadeonlyformaterialstestedundersimilarconditionsofapparatus,specimensize,andsoforth.Furthermore,theRITvaluemaynotpredictbehavioroflargequantitiesofmaterial.1.3TheRITshallnotbeusedbyitselftoestablishasafeoperatingtemperature.Itmaybeusedinconjunctionwithothertestmethods(forexample,E487,E537,andE1981)aspartofahazardanalysisofaparticularoperation.1.4ThistestmethodmaybeusedforRITvaluesgreaterthan15min(asrelativeimprecisionincreasesatshorterperiods).1.5Thistestmethodisusedtostudycatalyticandautocatalyticreactions.Thesereactionsdependupontimeaswellastemperature.Suchreactionsareoftenstudiedbyfixingoneexperimentalparameter(thatis,timeortemperature)andthenmeasuringtheotherparameter(thatis,temperatureortime).Thistestmethodmeasurestimetoreactiononsetdetectionunderisothermalconditions.ItisrelatedtoTestMethodE487thatmeasuresdetectedreactiononsettemperatureunderconstanttimeconditions1.6ThevaluesstatedinSIunitsaretoberegardeda......
【中国标准分类号】:A42
【国际标准分类号】:17_200_20
【页数】:5P.;A4
【正文语种】:英语