{"term":{"id":"07140","title":"main-chain scission","longtitle":"IUPAC Gold Book - main-chain scission","doi":"10.1351\/goldbook.MT07140","code":"MT07140","status":"current","definitions":[{"id":1,"text":"Chemical reaction that results in the breaking of main-chain bonds of a polymer molecule.","notes":{"1":"Some main-chain scissions are classified according to the mechanism of the scission process: hydrolytic, mechano-chemical, thermal, photo-chemical, or oxidative scission. Others are classified according to their location in the backbone relative to a specific structural feature, for example, α-scission (a scission of the C–C bond alpha to the carbon atom of a photo-excited carbonyl group) and β-scission (a scission of the C–C bond beta to the carbon atom bearing a radical), etc."},"links":[{"term":"backbone","url":"https:\/\/goldbook.iupac.org\/terms\/view\/B00574"},{"term":"polymer molecule","url":"https:\/\/goldbook.iupac.org\/terms\/view\/M03667"}],"sources":["PAC, 2004, 76, 889. 'Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003)' on page 892 (https:\/\/doi.org\/10.1351\/pac200476040889)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/MT07140\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/MT07140\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/MT07140\/plain"},"citation":"Citation: 'main-chain scission' 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.MT07140","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":"2026-08-10T05:43:18+00:00"}}