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By contrast, silicon\u2010containing cyclic olefin polymers (Si\u2010COPs)\u2014promising alternatives to conventional COPs\u2014remain largely unexplored. Herein, we report a radical cyclopolymerization strategy enabled by the\n                    <jats:italic>\u03b2<\/jats:italic>\n                    \u2011silicon effect for the efficient synthesis of Si\u2010COPs. Harnessing the\n                    <jats:italic>\u03b2<\/jats:italic>\n                    \u2010silicon effect to stabilize radical intermediates suppresses the inherent chain transfer tendency of non\u2010conjugated diene monomers in radical cyclopolymerization and enables the control of the cyclization selectivity. Density functional theory (DFT) calculations provide mechanistic insight into the polymerization pathway. The resulting Si\u2010COPs serve as versatile platforms for post\u2010polymerization modification and undergo controlled degradation under mild conditions. Furthermore, cross\u2010linked Si\u2010COPs fabricated via thiol\u2013ene chemistry exhibit optical properties comparable to those of commercial COPs, together with outstanding adhesion performance.\n                  <\/jats:p>","DOI":"10.1002\/anie.3934020","type":"journal-article","created":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T14:35:21Z","timestamp":1783434921000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Harnessing the\n                    <i>\u03b2<\/i>\n                    \u2010Silicon Effect for Radical Cyclopolymerization: Direct Access to Si\u2010Containing Cyclic Olefin Polymers"],"prefix":"10.1002","volume":"65","author":[{"given":"Xu","family":"Zhang","sequence":"first","affiliation":[{"name":"Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering State Key Laboratory of Polyolefins and Catalysis State Key Laboratory of Synergistic 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