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1、StudyonCureBehaviorofaModelEpoxySystembyMeansofTTTDiagramStudyonCureBehaviorofaModelEpoxySystembyMeansofTTTDiagram57StudyonCureBehaviorofaModelEpoxySystembyMeansofTTTDiagramZHANGMing,ANXue—feng,TANGBang—ming,YIXiao—su(NationalKeyLaboratoryofAdvancedComposites,BeijingInstituteofAeronau
2、ticalMaterials,Beijing100095,China)Abstract:Curingbehaviorofamodelepoxiessystem(E-54/AG-80)withDDSashardenerwasstudiedinthispaper.RounddiskcompressionmodeDMAwasexecutedtostudythegelbehaviorsatdifferenttemperaturestodeterminethere—lationshipbetweengel—time(￡1)andtemperature.Thecurekine
3、ticswasstudiedbydynamicDSCanalysis.Parameterswereobtainedforestablishingaphenomenologicalcurereactionmode1.Therelationshipbetweenglasstransitiontempera—ture(T)andcuredegree(口)wasalsoanalyzedbybothisothermalanddynamicDSCmethodbasedonDiBenedettoequa—tion.whichgaveamathematicaldescriptio
4、nofTsasafunctionofbothtimeandtemperature.Consequently,characteris—tictemperaturessuchasTs0gelandweredetermined.Finally,theTime-Temperature-Transition(TTT)diagramwasdesignedbasedonthedataandequations.Keywords:epoxyresin;curebehavior;TTTdiagramCLCnumber:TB33Documentcode:AArticleID:1001—
5、4381(2006)05—0057-06Duetotheirhighstrength,modulusandfracturetoughnessaswellasgoodadhesionandthermalre—sistance[¨,epoxyresinsasmatricesarewidelyusedinaeronautics,astronautics,transportation,sportsandotherindustry.StandardepoxyresinsareusuallybasedonDGEBA(diglycidyletherofbisphenolA),w
6、hichneedsactivehydrogenorotheractivegroupstoopentwoepoxyrings.Four-functionalepoxylikeTGMDA(tetraglycidylmethylenedianiline)isoftenusedforhigh-performanceepoxymatrixcompositesbecauseofitsrelativelyhighercross—linkingdensityoverDGEBA.TGMDAcanserveathighertempera—turesthanDGEBA.However,
7、duetothehighercross—linkingdensity,TGMDAisintrinsicallybrit—tle.Apracticalsolutionforoptimizingthepropertiesistouseabi—-componentblendofDGEBAandTGM—'DA.Itwasexpectedthattheblendepoxysystemcouldprovidehigherstrength,modulus,fracturetoughnessand.highertemperatureresistance.Itwastheinten
8、siono
