{"term":{"id":"08948","title":"combination","longtitle":"IUPAC Gold Book - combination","doi":"10.1351\/goldbook.08948","code":"08948","status":"current","definitions":[{"id":1,"text":"Chain termination, in a chain polymerization, between two propagating macromolecules that gives rise to a single macromolecule of molar mass equal to the sum of the molar masses of the two macromolecules.","notes":{"1":"Combination is often incorrectly called 'recombination'. The term recombination should only be used to refer to the reaction, with each other, of two transient species produced from a common precursor.","2":"Combination is also called colligation, although this terminology is not commonly used in the context of chain polymerization."},"links":[{"term":"Chain termination","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08946"}],"sources":["PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1119 (https:\/\/doi.org\/10.1515\/pac-2020-1211)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08948\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08948\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08948\/plain"},"citation":"Citation: 'combination' 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.08948","license":"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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"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.","accessed":"2026-06-21T12:12:46+00:00"}}