Degradation of poly(ethylene terephthalate) waste with dimethyl tin distanoxane as a catalyst

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1、DegradationofPoly(ethyleneterephthalate)WastewithDimethylTinDistanoxaneasaCatalyst1111E.VillafuerteBaez,M.G.SanchezAnguiano,V.M.JimenezPerez,N.A.PerezRodrıguez,2S.VazquezRodrıguez1UniversidadAutonomadeNuevoLeon,UANL,FacultaddeCienciasQuımicas,AvenidaS/Nsinnumero,Av.UniversidadS/NC

2、iu-dadUniversitariaSanNicolasdelosGarzaNuevoLeonCP66451,Mexico2UniversidadAutonomadeNuevoLeon,UANL,FacultaddeIngenierıaMecanicayElectricaCorrespondenceto:M.G.SanchezAnguiano(E-mail:magsa73@yahoo.com.mx)ABSTRACT:Inthisarticle,wereportthedegradationofpoly(ethyleneterephthalate)(PET),

3、whichoccursthroughglycolysisinthepresenceofdimethyltindistanoxane[(CH3)2Sn(OCOCH3)2]asacatalyst,triethyleneglycol(TEG)asanucleophilicagent,anddeca-linelikeasolvent.Anumberofexperimentswereexecuted,whichwerederivedfromafactorialexperimentaldesign,inwhichthereactiontimewasbetween40and60min,the

4、amountofTEGwasbetween3.4and5.6g,andtheamountofcatalystwasbetween0.04and0.06%inratiotoPET.Thereactiontemperaturewasconstantat175Cinalloftheexperiments.Oncetheglycolyticdepo-lymerizationoccurred,oligomerswithamolecularweightaround6000g/molwereobtained.Theseoligomerswereanalyzedthrough1gelperm

5、eationchromatography,differentialscanningcalorimetry,Fouriertransforminfraredspectroscopy,andH-NMR.VC2013WileyPeriodicals,Inc.J.Appl.Polym.Sci.130:34823488,2013KEYWORDS:catalysts;degradation;polyestersReceived31August2011;accepted14March2013;Publishedonline24June2013DOI:10.1002/app.39361INTR

6、ODUCTIONInpreviousresearch,thedegradationofPEThasreportedlyuseddifferentmetalacetatesascatalysts,propyleneglycol,andPoly(ethyleneterephthalate)(PET)isathermoplasticpolymeranexcessofethyleneglycol(EG)asanucleophilicagentatusedwidelyinthemanufacturingofdifferentproducts,for190200Cfor8h.Thepro

7、ductsobtainedwereoligomerswithexample,photographicfilms,audioandvideotapes,automotive1molecularweightsbetween276and480g/mol.Zincacetatewasparts,toys,andespeciallyincarbonateddrinkcontainers.PET5,6thebestintermsoftheextentofdepolymerization.Chenandb