08946 IUPAC Gold Book - chain termination 10.1351/goldbook.08946 08946 current synonyms: irreversible chain deactivation, termination 1 Chemical reaction in which a chain carrier is converted irreversibly into a non-propagating species without the formation of a new chain carrier. The recommended symbol for the rate coefficient for chain termination in a polymerization is \(k_{\rm{t}}\). The term 'chain deactivation' is often used to stress that, in contrast to chain termination, the formation of non-propagating species may be reversible; see chain deactivation. chain deactivation https://goldbook.iupac.org//terms/view/08943 combination https://goldbook.iupac.org//terms/view/08948 non-propagating species https://goldbook.iupac.org//terms/view/08953 PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1118 (https://doi.org/10.1515/pac-2020-1211) https://goldbook.iupac.org/terms/view/08946/html https://goldbook.iupac.org/terms/view/08946/json https://goldbook.iupac.org/terms/view/08946/plain Citation: 'chain termination' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.08946 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-21T14:07:28+00:00