{"term":{"id":"15412","title":"patterns of reactivity scheme","longtitle":"IUPAC Gold Book - patterns of reactivity scheme","doi":"10.1351\/goldbook.15412","code":"15412","status":"current","synonym":"<em>synonym<\/em>: Jenkins’ scheme","definitions":[{"id":1,"text":"Method for the prediction of monomer reactivity ratios in binary copolymerization, based exclusively on experimentally determined parameters.","notes":{"1":"The parameters may be the monomer reactivity ratios for the separate copolymerizations of the monomers concerned, namely, 1 and 2, with a nonpolar monomer, e.g., styrene (\\(\\rm{S}\\)), and a polar monomer, e.g., acrylonitrile (\\(\\rm{A}\\)). The equations for the desired monomer reactivity ratios, \\(r_{12}\\) and \\(r_{21}\\), are then as follows: \\[\\ln r_{12} = \\ln (r_{1\\rm{S}} r_{\\rm{S}2}) - [\\ln\\,(r_{\\rm{AS}} r_{\\rm{S}2}\/r_{\\rm{A}2)}][\\ln\\,(r_{\\rm{SA}} r_{1\\rm{S}}\/r_{1\\rm{A}})]\/\\ln\\,(r_{\\rm{AS}} r_{\\rm{SA}})\\] \\[\\ln r_{21} = \\ln (r_{2\\rm{S}} r_{\\rm{S}1}) - [\\ln\\,(r_{\\rm{AS}} r_{\\rm{S}1}\/r_{\\rm{A}1)}][\\ln\\,(r_{\\rm{SA}} r_{2\\rm{S}}\/r_{2\\rm{A}})]\/\\ln\\,(r_{\\rm{AS}} r_{\\rm{SA}})\\]","2":"The patterns of reactivity scheme is known also as Jenkins’ scheme."},"contexts":[],"links":[{"term":"binary copolymerization","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/15383"}],"sources":["PAC, 2008, 80, 2163. 'Glossary of terms related to kinetics, thermodynamics, and mechanisms of polymerization (IUPAC Recommendations 2008)' on page 2180 (https:\/\/doi.org\/10.1351\/pac200880102163)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/15412\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/15412\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/15412\/plain"},"citation":"Citation: 'patterns of reactivity scheme' 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.15412","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":"2026-04-18T06:54:23+00:00"}}