Thermal degradation mechanism and rate constants of the thermal degradation of poly(epichlorohydrin-co-ethylene oxide), deduced from pyrolysis-GC-MS studies

dc.creatorSoto-Oviedo, MA
dc.creatorLehrle, RS
dc.creatorParsons, IW
dc.creatorDe Paoli, MA
dc.date2003
dc.dateSEP
dc.date2014-11-17T14:45:06Z
dc.date2015-11-26T16:44:06Z
dc.date2014-11-17T14:45:06Z
dc.date2015-11-26T16:44:06Z
dc.date.accessioned2018-03-28T23:29:20Z
dc.date.available2018-03-28T23:29:20Z
dc.identifierPolymer Degradation And Stability. Elsevier Sci Ltd, v. 81, n. 3, n. 463, n. 472, 2003.
dc.identifier0141-3910
dc.identifierWOS:000184455000011
dc.identifier10.1016/S0141-3910(03)00131-9
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/58005
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/58005
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/58005
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1273808
dc.descriptionThe thermal degradation mechanism and kinetic parameters for the overall degradation for the poly(epichlorohydrin-co-ethylene oxide) elastomer have been investigated by pyrolysis-gas chromatography-mass spectrometry (pyrolysis-GC-MS) techniques. In this study the total volatile products from the pyrolysis of the elastomer at different temperatures were measured as a Total Ion Current (TIC) in the mass spectrometer. Information about the components within the TIC was obtained from measurements of the Selected Ion Currents (SIC) of ions of different m/z ratios. Amongst the m/z ratios observed, those corresponding to ions of m/z of 35, 36, 37, and 38 confirmed that HCl is one of the pyrolysis products. SIC measurements for a wide range of other possible degradation products were examined in order to assess the general structures, and these revealed that a wide range of low molar mass hydrocarbons and chlorohydrocarbons are formed on thermal degradation of the elastomer. The results suggest that a major mechanistic process is the depolymerization of macroradicals, and that hydrogen abstraction from a carbon atom adjacent to a C-O bond is an important process in the formation of volatile products. This information has led to the postulation of a possible mechanism for the thermal degradation of the elastomer. Quantitative kinetic measurements were made by evaluating the overall rate of production of volatile products using the TIC obtained from sequence pyrolysis experiments. The data leading to this overall rate constant (k) was interpreted in several ways, i.e. according to the Ericsson, Guggenheim and Kezdy-Jaz-Bruylants methods. The average values obtained for this overall rate constant were 0.16 +/- 0.03, 0.25 +/- 0.03, and 0.55 +/- 0.20 s(-1) for pyrolysis temperatures of 350, 387, and 400 degreesC, respectively. (C) 2003 Elsevier Ltd All rights reserved.
dc.description81
dc.description3
dc.description463
dc.description472
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationPolymer Degradation And Stability
dc.relationPolym. Degrad. Stabil.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectpyrolysis-GC-MS
dc.subjectpoly(epichlorohydrin-co-ethylene oxide) elastomer
dc.subjectthermal degradation mechanism
dc.subjectkinetics
dc.subjectrate constants
dc.subjectMass-spectrometry
dc.subjectGas Chromatography
dc.subjectPolymers
dc.subjectChlorine
dc.subjectKinetics
dc.subjectBehavior
dc.subjectHcl
dc.titleThermal degradation mechanism and rate constants of the thermal degradation of poly(epichlorohydrin-co-ethylene oxide), deduced from pyrolysis-GC-MS studies
dc.typeArtículos de revistas


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