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聚氯乙烯管材中聚氯乙烯树脂含量的测定方法 Title:DeterminationMethodofPolyvinylChlorideResinContentinChlorinatedPolyvinylChloridePipeMaterials Abstract: Polyvinylchloride(PVC)pipesarewidelyusedinvariousindustriesduetotheirexcellentphysicalandchemicalproperties.Thepolyvinylchlorideresincontentinchlorinatedpolyvinylchloride(CPVC)pipematerialsplaysacrucialroleindeterminingthequalityandperformanceofthepipes.ThispaperaimstointroduceanddiscussvariousmethodsthatcanbeusedtomeasurethePVCresincontentinCPVCpipematerials.Thesemethodsincludegravimetricanalysis,Fouriertransforminfraredspectroscopy(FTIR),thermogravimetricanalysis(TGA),anddifferentialscanningcalorimetry(DSC).Theadvantages,limitations,andapplicationconsiderationsofeachmethodwillbediscussed,providingacomprehensivereviewofthedeterminationtechniquesforPVCresincontentinCPVCpipematerials. 1.Introduction Polyvinylchloride(PVC)isawidelyusedmaterialintheproductionofpipesduetoitsexcellentchemicalresistance,highmechanicalstrength,lowcost,andeasyprocessing.Chlorinatedpolyvinylchloride(CPVC)pipesarepreparedbychlorinatingPVCresin,resultinginimprovedheatresistanceandsuperiormechanicalpropertiescomparedtoregularPVCpipes.ThePVCresincontentinCPVCpipematerialssignificantlyaffectsthefinalpropertiesandperformanceofthepipe.Therefore,anaccurateandreliabledeterminationmethodforPVCresincontentisessentialforqualitycontrolpurposes. 2.GravimetricAnalysis GravimetricanalysisisacommonandstraightforwardmethodtodeterminethePVCresincontentinCPVCpipematerials.ItinvolvesdissolvingtheCPVCsampleinasuitablesolventandprecipitatingthePVCresinbyaddinganonsolvent.TheprecipitatedPVCresinisthencollected,dried,andweighed.TheweightofthePVCresinisusedtocalculateitscontentintheCPVCsample.Althoughgravimetricanalysisisrelativelysimpleandwidelyused,itrequirescarefulhandlingandprecisemeasurementstoensureaccurateresults. 3.FourierTransformInfraredSpectroscopy(FTIR) FTIRcanalsobeusedtodeterminethePVCresincontentinCPVCpipematerials.ThismethodreliesontheuniqueinfraredabsorptionpeakofPVCresin