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1、PolymerDegradationandStability96(2011)1179e1186ContentslistsavailableatScienceDirectPolymerDegradationandStabilityjournalhomepage:www.elsevier.com/locate/polydegstabThermal-oxidativeagingofDGEBA/EPN/LMPAepoxysystem:Chemicalstructureandthermalemechanicalpropertiesaa,*abbYan-minPei,KaiWang,Mao-shengZh
2、an,WenXu,Xiao-junDingaKeyLaboratoryofAerospaceMaterialsandPerformance(MinistryofEducation),SchoolofMaterialsScienceandEngineering,BeihangUniversity,No.37,XueyuanRoad,Beijing100191,ChinabAerospaceResearchInstituteofMaterialsandProcessingTechnology,Beijing100076,ChinaarticleinfoabstractArticlehistory:
3、TheevolvementofchemicalstructureandthermalemechanicalpropertiesofdiglycidyletherofReceived3February2011bisphenol-Aandnovolacepoxyresinblendscuredwithlowmolecularpolyamide(DGEBA/EPN/LMPAReceivedinrevisedformsystem)duringthermal-oxidativeagingwereinvestigatedbyAttenuatedTotalReflectanceFourier8April201
4、1TransformInfraredspectrometry(ATR-FTIR)andDynamicMechanicalThermalAnalysis(DMTA).TheAccepted25April2011resultsrevealedthatthechemicalreactionsduringthermal-oxidativeagingcontainedoxidationandAvailableonline1May2011chainscission.Somepossiblechemicalreactionprocessesweregiven.Therewasanewcompoundform
5、edduringagingprocessesandthechangeofitsglasstransitiontemperature(Tg)withagingtimeKeywords:followedanexponentiallaw.Inaddition,thechangesofdynamicmechanicalbehaviorofthisepoxyEpoxyresinsystemagedatfourdifferenttemperatures(110C,130C,150C,170C)werecompared.AnempiricalThermal-oxidativeagingDMTAfor
6、mulawasobtainedthroughkineticanalysisandthisformulacanbeusedtopredicttheoxidativeATR-FTIRdegreeofthesurfaceatdifferentagingtemperature.Ó2011ElsevierLtd.Allrightsreserved.1.Introductionagingmainlyincludeschemicalstructurechangesofpolymerresultingfromhightemperature,oxygen,water,etc.ManystudiesMateria
7、lsderivedfromepoxyresinhavebeenwidelyusedinsuggestthatchemicalreactionsofepoxyresinduringthermal-polymerindustrysuchasadhesives,coatings,compositesmatrix,oxidativeagingmainlycontainspost-cure[7e9],car
