Depletion mechanism of antioxidants in MDPE-clay nanocomp osites under.pdf

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1、PolymerDegradationandStability97(2012)192e199ContentslistsavailableatSciVerseScienceDirectPolymerDegradationandStabilityjournalhomepage:www.elsevier.com/locate/polydegstabDepletionmechanismofantioxidantsinMDPE-claynanocompositesunderthermalagingabbccWai-KuenWong,ShanCheng,ChristopherY.Li,Ifte

2、kharAhmad,RichardCairncross,a,*Y.GraceHsuanaDepartmentofCivil,ArchitecturalandEnvironmentalEngineering,DrexelUniversity,Philadelphia,PA19104,USAbDepartmentofMaterialsScienceandEngineering,DrexelUniversity,Philadelphia,PA19104,USAcDepartmentofChemicalandBiologicalEngineering,DrexelUniversity,P

3、hiladelphia,PA19104,USAarticleinfoabstractArticlehistory:Thedepletionbehavioroftwotypesofhinderedphenolicantioxidants(AO),IrganoxÒ1010(I-1010)andReceived9May2011IrganoxÒ1076(I-1076),inmediumdensitypolyethylene(MDPE)/nanoclaycompositewasevaluatedbyReceivedinrevisedformincubatingsamplesinaforce

4、dairovenat85C.Thepresenceof4wt%nanoclayacceleratedthe7October2011depletionofbothtypesofAO,particularlyatthesurfaceregionofthesample.However,thedepletionAccepted12October2011mechanismintheinteriorofsamplewasgovernedbytheAOmolecularstructure.Forsamplescon-Availableonline20October2011tainingthe

5、bulkyIrganoxÒ1010,OITdecreasedexponentiallywithagingtimeconsistentwithafirstorderreaction.Incontrast,anincreaseofOITwasdetectedinfirst60daysofheatagingforsampleKeywords:containingI-1076andafterwardtheOITdecreasedslowlywithagingtime.ThehypothesisfortheinitialNanocompositeAntioxidantincreaseofOIT

6、isthattherelativelysmallandlinearstructureofI-1076mayenableittobetrappedinsidePolyethylenethenanoclaygalleriesandthensubsequentlyreleasedintothepolymermatrixduringheataging.NanoclayPublishedbyElsevierLtd.Heataging1.IntroductionhinderedphenolicAOsinPE/nanoclaycompositeshasbeenstudiedunderather

7、mallyacceleratedagingenvironment.TheamountofInthepastdecade,polymerclaynanocompositeshaveattractedAOretainedintheagedsamplewasmonitoredusingoxidativeconsiderableinterestinmanyindustries.Ithasbeendemonstratedinductiontime(OIT)test.thatmanyshor