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Rapid Commun."],"published-print":{"date-parts":[[2025,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This study presents an organocatalytic C\u2212H functionalization approach for postpolymerization modification (PPM) of poly(ethylene oxide) (PEO). Most of PEO PPM is previously processed at the end hydroxy group, but recent advances in C\u2010H functionalization open a way to modify the backbone position. Structurally diverse carboxylic acids are attached to PEO through a cascade process of radical generation by peroxide and oxidation to oxocarbenium by tertiary butylammonium iodide. Attaching carboxylic acids yields a series of functionalize PEO with acetal units (2\u22125 mol%) in a backbone, which is not accessible via conventional copolymerization of epoxides. The optimized conditions minimizes the uncontrolled degradation or crosslinking from the highly reactive radical and oxocarbenium intermediate. The newly introduced acetal units bring degradability of PEO as well as delivery of carboxylic acid molecules. Hydrolysis studies with high molecular weight functionalization PEO (<jats:italic>M<\/jats:italic><jats:sub>n<\/jats:sub> = 13.0\u00a0kg\u00a0mol<jats:sup>\u22121<\/jats:sup>) confirm the steady release of fragmented PEO (<jats:italic>M<\/jats:italic><jats:sub>n<\/jats:sub> \u223c 2.0\u00a0kg\u00a0mol<jats:sup>\u22121<\/jats:sup>) and carboxylic acid over days and the process rate is not sensitive to pH variation between pH 5 and 9. The presented method offers a versatile and efficient way to modify PEO with potential energy and medical applications.<\/jats:p>","DOI":"10.1002\/marc.202400613","type":"journal-article","created":{"date-parts":[[2024,10,7]],"date-time":"2024-10-07T18:05:14Z","timestamp":1728324314000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["C\u2013H Functionalization of Poly(ethylene oxide) \u2013 Embracing Functionality, Degradability, and Molecular Delivery"],"prefix":"10.1002","volume":"46","author":[{"given":"Se Jong","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Chemistry and Research Institute of Physics and Chemistry Jeonbuk National University Jeonju 54896 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eun Ji","family":"Hong","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Research Institute of Physics and Chemistry Jeonbuk National University Jeonju 54896 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nuri","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Research Institute of Physics and Chemistry Jeonbuk National University Jeonju 54896 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nuri","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Bionanotechnology and Bioconvergence Engineering Jeonbuk National University Jeonju 54896 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minseong","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemistry Yonsei University Seoul 03722 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aram","family":"Shin","sequence":"additional","affiliation":[{"name":"Department of Chemistry Yonsei University Seoul 03722 Republic of 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