Thermal stability of 6FDA-(co-)polyimides containing carboxylic acid groups

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1、PolymerDegradationandStability95(2010)684e693ContentslistsavailableatScienceDirectPolymerDegradationandStabilityjournalhomepage:www.elsevier.com/locate/polydegstabThermalstabilityof6FDA-(co-)polyimidescontainingcarboxylicacidgroupsJanU.Wieneke,ClaudiaStaudt*DepartmentofOrganicandMacromolecularChemis

2、try,Heinrich-Heine-University,Universitätsstr.1,40225Düsseldorf,GermanyarticleinfoabstractArticlehistory:Different(co-)polyimideswithandwithoutcarboxylicacidgroupshavebeensynthesized,characterizedReceived10September2009andthinfilmshavebeenprepared.Agingaswellasdegradationeffectsattemperaturesupto380

3、CAccepted23November2009havebeeninvestigatedinordertodeterminewhetherhightemperatureapplicationsarepossible.ThusAvailableonline18January20100thisworkwasfocusedonaromaticfluorinatedpolyimidesandcopolyimidesderivedfrom6FDA(4,4-hexafluoroisopropylidenediphthalicanhydride),4MPD(2,3,5,6-tetramethyl-1,4-phen

4、ylenediamine)andKeywords:DABA(3,5-diaminobenzoicacid),since6FDA-(co-)polyimidesarewellknownforhighstabilityandThermaltreatmentsuperiorprocessability.Agingprocesseshavebeenanalyzedusinginfraredspectroscopy,density(Co-)Polyimidesmeasurementsandthermogravimetricanalysis.Ithasbeenfoundthatupto380Cthesy

5、nthesizedMembranesGasseparationmaterialsshowminorweightlossesandagingeffectsbutremainmechanicallystable.Ontheonehandsomepropertieslikecolourandsolubilitychangedbutontheotherhandgasseparationcharacteristicscouldbeimproved.Inallcasesstructureandmechanicalstabilitypersistedafterheattreatment.Theanalyti

6、calresultsleadtotheconclusionthatthesynthesizedmaterialscanbeusedashighperformancepolymersinvariousapplications,i.e.hydrogenfuelcellandaerospaceapplications.Ó2009ElsevierLtd.Allrightsreserved.1.Introductionmembranes,protectivelayers,resists,hightemperatureglues,ordielectricmaterials.Inordertoestimat

7、etheapplicationpotentialofAsmanypolymerscannotwithstandtemperatureshigherthanpolyimidesatelevatedtemperaturesthedegradationbehaviour200Cbecauseoftoolowglasstransitionandmeltingtempera-anditsinfluenceo