Title: initialization efficiency Long Title: IUPAC Gold Book - initialization efficiency DOI: 10.1351/goldbook.08958 Status: current Definition Efficiency of conversion of a starting initiator or transfer agent into a macro-initiator or macro-chain-transfer agent. Related Terms - initiator efficiency for initiation of polymerization: https://goldbook.iupac.org//terms/view/08960 - macro-chain-transfer agent: https://goldbook.iupac.org//terms/view/08962 - macro-initiator: https://goldbook.iupac.org//terms/view/08963 - transfer agent: https://goldbook.iupac.org//terms/view/08947 Source - PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1122 (https://doi.org/10.1515/pac-2020-1211) Other Outputs - html: https://goldbook.iupac.org/terms/view/08958/html - json: https://goldbook.iupac.org/terms/view/08958/json - xml: https://goldbook.iupac.org/terms/view/08958/xml Citation: Citation: 'initialization efficiency' 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.08958 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: 2026-06-21T23:27:06+00:00