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However, current reports of mid\u2010chain depolymerization either suffer from poor reaction yields or rely on an excess of chlorinated solvents to generate only a small fraction of chlorinated radicals with corrosive byproducts. Herein, we introduce a chlorine\u2010free photothermal mid\u2010chain depolymerization methodology, which proceeds through a distinct oxygen\u2010centered radical pathway. In the presence of ppm concentrations of anthraquinone, an efficient photocatalyst, up to 97% monomer can be successfully regenerated, while varying the catalyst loading allows the depolymerization rate to be modulated on demand. Notably, a wide range of commercial materials, such as Plexiglas, acrylic tubes, and light guide plates, can undergo efficient depolymerization, while temporal control could also be demonstrated via iterative \u201con\/off\u201d cycles.<\/jats:p>","DOI":"10.1002\/anie.6957018","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T11:58:39Z","timestamp":1785153519000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Chlorine\u2010Free Depolymerization of Commercial PMMA via Oxygen\u2010Centered Radicals"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-0901-0760","authenticated-orcid":false,"given":"Chih\u2010Yin","family":"Lin","sequence":"first","affiliation":[{"name":"Laboratory of Sustainable Polymers Department of Materials ETH Zurich  Z\u00fcrich 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