{"term":{"id":"15400","title":"entropy of polymerisation","longtitle":"IUPAC Gold Book - entropy of polymerisation","doi":"10.1351\/goldbook.15400","code":"15400","status":"current","synonym":"<em>synonym<\/em>: molar entropy of polymerization","definitions":[{"id":1,"text":"Change of entropy, in a chain polymerization forming a homopolymer, associated with the conversion of one mole of monomer into polymer under isobaric and isothermal conditions.","notes":{"1":"Under defined standard conditions, the entropy of polymerization is designated \\(\\Delta S_{\\rm{m}}^{\\circ}\\); thus, if the standard state refers to standard concentration, and the monomer behaves ideally, \\(\\Delta S_{\\rm{m}} = \\Delta S_{\\rm{m}}^{\\circ} + R\\ln ([{\\rm{M]}}_{0}\/c^{\\circ})\\), where \\([{\\rm{M}}]_{0}\\) denotes the starting monomer concentration and \\(c^{\\circ} = \\pu{1 mol dm-3}\\) is the standard concentration.","2":"The subscripts in \\(\\Delta_{\\rm{ab}} S_{\\rm{m}}\\) denote the state of the monomer (a) and the state of polymer (b) (see enthalpy of polymerization (Note 2))."},"links":[{"term":"enthalpy of polymerization (Note 2)","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/15399"}],"sources":["PAC, 2008, 80, 2163. 'Glossary of terms related to kinetics, thermodynamics, and mechanisms of polymerization (IUPAC Recommendations 2008)' on page 2174 (https:\/\/doi.org\/10.1351\/pac200880102163)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/15400\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/15400\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/15400\/plain"},"citation":"Citation: 'entropy of polymerisation' 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.15400","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"}}