The acceleratory degradation of solids represents an area of research where extreme care must be exercised to obtain reproducible data. Different preparations of the same substance often show great variation in degradation patterns. Many kinetic equations have been developed to describe the kinetics of acceleratory degradations. Most of them are empirical and apply only to certain phases of a degradation. The non-steady-state kinetics which were developed to describe the zip degradation of poly(vinyl chloride) will be shown to describe effectively the unusual degradation behavior of inorganic solids that follow an acceleratory pattern.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation energies and frequency factors for the dehydrochlorination of poly(vinyl chloride) from the Arrhenius equationJoseph D. Danforth and James IndiveriCite this: J. Phys. Chem. 1983, 87, 26, 5376–5380Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 December 1983https://doi.org/10.1021/j150644a014RIGHTS & PERMISSIONSArticle Views133Altmetric-Citations7LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (709 KB) Get e-Alerts
The degradation of five samples of PVC having different degrees of polymerization has been studied by a technique that permits a precise measurement of the rate of hydrogen chloride elimination as % HCl/min. All samples followed acceleratory kinetics at both low and high conversions. The conversion rate, which changed from the beginning to the end of a degradation, depended primarily upon the fraction of chains producing hydrogen chloride. The fraction of producing chains and the kinetic pattern were influenced by the presence of hydrogen chloride, the physical state of the sample, the previous degradation history, and the presence of intentionally added substances. Zipper kinetics permit the reproduction of kinetic data in terms of three parameters: k1, the fraction of chains initiating per second, k2, the fraction of a zip chain that zips per second, and k3, an arbitrary parameter that accounts for residual hydrogen chloride after degradation has ceased.
Kinetic equations have been developed for polymers that decompose by the zipper mechanism. The usual assumption of steady state kinetics has not been made. Plots of the fraction decomposed α, as a function of time demonstrate a variety of patterns depending upon the relative values of the fraction k1, of chains becoming activated per second and the fraction k2 of an activated chain that decomposes per second.
AbstractEquations derived on the basis of a zipper mechanism under conditions where steadystate kinetics did not apply were found to represent the kinetics of the thermal decomposition of poly(vinyl chloride) in the temperature range 220–240°C.
Chemischer InformationsdienstVolume 3, Issue 8 Preparative Organic Chemistry ChemInform Abstract: CHEMIE UND KINETIK DER THERMISCHEN ZERS. VON ZINK- UND MAGNESIUMOXALAT JOSEPH D. DANFORTH, JOSEPH D. DANFORTHSearch for more papers by this authorJAMES DIX, JAMES DIXSearch for more papers by this author JOSEPH D. DANFORTH, JOSEPH D. DANFORTHSearch for more papers by this authorJAMES DIX, JAMES DIXSearch for more papers by this author First published: February 22, 1972 https://doi.org/10.1002/chin.197208328AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume3, Issue8February 22, 1972 RelatedInformation
Chemischer Informationsdienst. Organische ChemieVolume 2, Issue 42 Organoelement Compounds ChemInform Abstract: THERMISCHE ZERS. VON KALIUM-TRIS-(OXALATO)-FERRAT(III) JOSEPH D. DANFORTH, JOSEPH D. DANFORTHSearch for more papers by this authorJAMES DIX, JAMES DIXSearch for more papers by this author JOSEPH D. DANFORTH, JOSEPH D. DANFORTHSearch for more papers by this authorJAMES DIX, JAMES DIXSearch for more papers by this author First published: October 19, 1971 https://doi.org/10.1002/chin.197142087Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume2, Issue42October 19, 1971 RelatedInformation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and kinetics of the thermal decomposition of zinc and magnesium oxalatesJoseph D. Danforth and James DixCite this: J. Am. Chem. Soc. 1971, 93, 25, 6843–6846Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published inissue 1 December 1971https://pubs.acs.org/doi/10.1021/ja00754a025https://doi.org/10.1021/ja00754a025research-articleACS PublicationsRequest reuse permissionsArticle Views191Altmetric-Citations18LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of potassium tris(oxalato)ferrate(III)Joseph D. Danforth and Dix. JamesCite this: Inorg. Chem. 1971, 10, 8, 1623–1627Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://doi.org/10.1021/ic50102a016RIGHTS & PERMISSIONSArticle Views527Altmetric-Citations18LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (584 KB) Get e-Alerts Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of Silica–Alumina Cracking CatalystsJoseph D. DanforthCite this: J. Phys. Chem. 1955, 59, 6, 564–566Publication Date (Print):June 1, 1955Publication History Published online1 May 2002Published inissue 1 June 1955https://pubs.acs.org/doi/10.1021/j150528a021https://doi.org/10.1021/j150528a021research-articleACS PublicationsRequest reuse permissionsArticle Views214Altmetric-Citations12LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Dehydrogenation of Naphthenes by Sulfur DioxideJoseph D. Danforth and Mary Jane BenderCite this: Ind. Eng. Chem. 1954, 46, 8, 1701–1703Publication Date (Print):August 1, 1954Publication History Published online1 May 2002Published inissue 1 August 1954https://pubs.acs.org/doi/10.1021/ie50536a049https://doi.org/10.1021/ie50536a049research-articleACS PublicationsRequest reuse permissionsArticle Views85Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
