Title: patterns of reactivity scheme
Long Title: IUPAC Gold Book - patterns of reactivity scheme
DOI: 10.1351/goldbook.15412
Status: current

Definition
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.

Related Term
- binary copolymerization: https://goldbook.iupac.org//terms/view/15383

Source
- 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)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/15412/html
- json: https://goldbook.iupac.org/terms/view/15412/json
- xml: https://goldbook.iupac.org/terms/view/15412/xml

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
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Accessed: 2026-04-18T06:46:23+00:00