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The reaction does not involve the use of catalyst, metals, or expensive oxidants, and selectively introduces ketone functional groups. Under mild and operationally simple conditions, yields up to 1.23\u2005mol\u2009% of in\u2010chain ketones were achieved. Installation of in\u2010chain ketones resulted in materials with improved adhesion of the materials and miscibility of mixed plastics relative to the unfunctionalized plastics. The introduction of ketone groups into the polymer backbone allows these materials to react with diamines, forming dynamic covalent polyolefin networks. This strategy allows for the upcycling of mixed plastic waste into reprocessable materials with enhanced performance properties compared to polyolefin blends. Mechanistic studies support the involvement of photoexcited nitroaromatics in consecutive hydrogen and oxygen atom transfer reactions.<\/jats:p>","DOI":"10.1002\/anie.202418411","type":"journal-article","created":{"date-parts":[[2024,10,29]],"date-time":"2024-10-29T14:04:03Z","timestamp":1730210643000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Photooxidation of Polyolefins to Produce Materials with In\u2010Chain Ketones and Improved Materials Properties"],"prefix":"10.1002","volume":"64","author":[{"given":"Xin","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Chemistry Colorado State University  Center Ave Fort Collins CO 80523 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhitao","family":"Hu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Colorado State University  Center Ave Fort Collins CO 80523 United 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