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1、01复材老化MicrostructureEvolutionofSWEPNCompositesDuringHotAirAgingMicrostructureEvolutionofSW/EPNCompositesDuringHotAirAgingHong-MeiXiao,1Mao-ShengZhan,2WenXu,2Xiao-junDing21KeyLaboratoryofAerospaceMaterialsandPerformance(MinistryofEducation),SchoolofMaterialsScienceandE
2、ngineering,BeihangUniversity,Beijing100191,China2AerospaceResearchInstituteofMaterialsandProcessingTechnology,Beijing100076,ChinaCorrespondenceto:M.-S.Zhan(E-mail:zhanms@buaa.edu.cn)Inthisarticle,thehotairagingofhighstrengthglassfiberfabric/epoxynovolacresin(SW/EPN)co
3、mpositeswasinvesti-gatedbytheaidoftheagingbehaviorofEPN,mainlyfocusingonthemicrostructureevolvementofSW/EPNcomposites.TheagingmechanismandthermalmechanicalpropertiesofSW/EPNcompositeswereanalyzedbyFouriertransforminfraredspectroscopy,X-rayphotoelectronspectroscopy,the
4、rmo-gravimetricanalyzercoupledwithFouriertransforminfraredspectrometry,anddynamicmechani-calthermalanalysis.Theresultsshowedthatmicrocracksinitiatedandpropagatedatthefiber–matrixinterphasebecauseoftheheatandoxygeneffect.Afterlong-timeagingatelevatedtemperatures,delami
5、nationphenomenonwasdiscoveredinSW/EPNcomposites.TheresultsofweightchangesshowedthatthedegradationofEPNplayedamajorroleinSW/EPNcomposites.Moreover,thedegrada-tionofEPNcontainedpost-curing,oxidation,anddecomposition.TheresultsalsorevealedthatunagedEPNindicatedtwoglasstr
6、ansi-tiontemperatures(Tg1andTg2).Tg1increasedforpostcuringwhileTg2decreasedforoxidationwithincreasingofagingtimeandtemperature.Inthefinalperiodofagingathighertemperatures,onlyoneTgwasobservedbecausetheformationofperfectcrosslinkednetworksmadeEPNhomogeneous.Inaddition,
7、therelationshipbetweenTgandchemicalstructure,aswellasTgandmassloss,con-C2013WileyPeriodicals,Inc.J.Appl.Polym.Sci.2014,131,40128.firmedthatthevariationofTgdependedonchemicalchanges.VABSTRACT:KEYWORDS:ageing;degradation;composites;structure–propertyrelations;properties
8、andcharacterizationReceived9September2013;accepted27October2013DOI:10.1002/app.40128INTRODUCTIONAdvancedfiberreinforcepolyme
