15391 IUPAC Gold Book - copolymerisation composition equation 10.1351/goldbook.15391 15391 current synonym: Mayo–Lewis equation 1 Equation relating the instantaneous composition of a binary copolymer to the monomer reactivity ratios and the ratio of instantaneous monomer concentrations. The instantaneous composition of copolymer generally changes during the course of a copolymerization due to the changing composition of the monomer mixture (but see azeotropic polymerization). See also chain-end reactivity ratio, monomer reactivity ratios. Integrated forms of the copolymer composition equation have been developed to relate polymer composition to monomer reactivity ratios and monomer conversions. The copolymer composition equation is known also as the Mayo–Lewis equation. azeotropic polymerization https://goldbook.iupac.org//terms/view/15381 chain-end reactivity ratio https://goldbook.iupac.org//terms/view/15388 monomer reactivity ratios https://goldbook.iupac.org//terms/view/15410 PAC, 2008, 80, 2163. 'Glossary of terms related to kinetics, thermodynamics, and mechanisms of polymerization (IUPAC Recommendations 2008)' on page 2172 (https://doi.org/10.1351/pac200880102163) https://goldbook.iupac.org/terms/view/15391/html https://goldbook.iupac.org/terms/view/15391/json https://goldbook.iupac.org/terms/view/15391/plain Citation: 'copolymerisation composition equation' 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.15391 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. 2026-04-18T06:51:46+00:00