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作者:万博体育入口app    发布时间:2020-09-04 07:10    浏览量:81

Thermogravimetric,orthermalanalysis(TGAorTG)measureschangesinsampleweightinacontrolledthermalenvironmentasafunctionoftemperatureortime Thechangesinsampleweight(mass)canbearesultofalterationsinchemicalorphysicalpropertiesandcanbedetectedtoafractionofamicrogram  TGAisusefulforinvestigatingthermalstabilityofsolidorliquidmaterialsunderconditionsoframpingtemperatureinaninertgasatmosphereorinanoxidativegasatmosphere TGAcanalsobeconductedatconstanttemperaturetoevaluatethermalstabilityofmaterialsoveraspecifictimeperiod Forexample,potentialVOCemissionfrompesticidescanbemeasuredatconstanttemperaturefordeterminingtheamountandrateofmasslossoveraspecifiedtimeperiod

CouplingtheTGAtoaspectrophotometerallowsthestudyofvolatilespeciesandpyrolysisproducts,whichcanleadtodiscoveringhowacompoundorformulationdegradesandwhatcomponentsitcontains Forexample,TGAcoupledwithmassspectroscopy(MS)canprovidespecificinformationonchemicalstructureforidentifyingadditives,contaminantsandcompositionofblendsandcopolymers (TGA-EGA)

SignalDetected: MasschangeandtemperatureMaximumSampleWeight: 1gramTemperatureRange: Ambientto1000°C(1100°CavailableatsomesupportinglocationsTG-DTA)ControlledHeatingRate: 001to100°C/minuteWeighingPrecision: +/-001%

EvolvedproductsareidentifiedonlywhentheTGAisconnectedtoaspectrophotometer(egTGA/MSorTGA/FTIR) ThistechniqueisavailableatEAGLaboratoriesinsomesupportinglocations

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