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1、PolymerDegradationandStability96(2011)1097e1103ContentslistsavailableatScienceDirectPolymerDegradationandStabilityjournalhomepage:www.elsevier.com/locate/polydegstabAcceleratedartificialageingofnewdimerfattyacid-basedpolyamidesElodieHablot,AlbinTisserand,MichelBouquey,LucAvérous*LIPHT-ECPM,EAc
2、(CNRS)4379,UniversitédeStrasbourg,25rueBecquerel,67087Strasbourg,Cedex2,FrancearticleinfoabstractArticlehistory:Replacingpetroleum-basedrawmaterialswithrenewableresourcesisnowamajorchallengeintermsofReceived27October2010economicalandenvironmentalviewpoints.Vegetableoilsareexpectedtobeanintere
3、stingalternativetoReceivedinrevisedformproduceanewgenerationofbio-basedpolymers.Duetothepossibleoutdoorexposureindiverse17January2011applications,knowledgeoftheresistancetoweatherofthesenewmaterialsisanimportantissue,notAccepted26March2011onlyforaestheticaspectsasinrapidyellowing,butalsoforch
4、angesintheirproperties.NewinnovativeAvailableonline2April2011dimeracid-basedbio-polyamides(DAPA)wereexposedtoanartificialageingenvironmentproducedbyaUV/condensationweatheringdevicefordifferenttimes.Tofollowandtoevaluatethismaterialageing,Keywords:severaltechniqueswereemployedtocorrelatethechem
5、icalmodifications,withthemorphologyandtheBiobasedpolymersDimerfattyacidsmechanicalproperties.TheformationofperoxidewasfoundtobeveryrapidandaccompaniedbyhighPolyamidegelfractionformationandchainbreaking.Infraredspectroscopyshowedabuild-upofcarbonyl1Acceleratedartificialageingabsorptionintherang
6、e1700e1780cm,duetoprimaryandsecondaryphoto-oxidationproducts.Incorrelationwiththesemorphologicalevolutionsandinagreementwiththehighdecreaseoffusionenthalpybydifferentialscanningcalorimetry,X-Raydiffractionshowedanamorphoussolidstateafterageing.StrainestressmeasurementsrevealedachangeinDAPAbeh
7、aviour,varyingfromaductiletoanelastomericmaterial,beforeandafterageing,respectively.Ó2011ElsevierLtd.Allrightsreserved.1.Introductionreactive.DAhavehighmolecularweightscomparativelytoconven-tionaldiacidsandtheyareliquidatroomtemperature.Nowad
