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The approach involves the thermal depolymerization of PCR\u2010HDPE via pyrolysis, followed by fractional distillation to isolate C9\u2013C14 olefins. These olefins undergo hydroformylation using cobalt carbonyl catalysts to generate aldehydes, which are subsequently oxidized to carboxylic acids using Pinnick oxidation under mild aqueous\u2010phase conditions. Neutralization of the resulting carboxylic acids with sodium hydroxide produces plastic\u2010derived carboxylate surfactants (PDCs) in the form of sodium carboxylates. Subsequent purification steps ensure surfactant\u2010grade purity and enable accurate assessment of physicochemical properties. The resulting PDCs are evaluated for critical micelle concentration (CMC), foamability, surface tension reduction, and calcium ion tolerance, demonstrating competitive behavior with conventional anionic carboxylate surfactants. This route provides a sustainable alternative for surfactant production, reducing reliance on fossil\u2010derived feedstocks and valorizing plastic waste streams through chemical upcycling.<\/jats:p>","DOI":"10.1002\/anie.202517471","type":"journal-article","created":{"date-parts":[[2025,10,17]],"date-time":"2025-10-17T11:09:11Z","timestamp":1760699351000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Upcycling of Waste Plastics into Carboxylic Acids for Biodegradable Surfactants"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0192-6780","authenticated-orcid":false,"given":"Houqian","family":"Li","sequence":"first","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brandon W.","family":"Tipton","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5541-7204","authenticated-orcid":false,"given":"Hesham","family":"Aboukeila","sequence":"additional","affiliation":[{"name":"School of Sustainable Chemical Biological and Materials Engineering University of Oklahoma  Norman OK 73019 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-1460-5083","authenticated-orcid":false,"given":"Enner A.","family":"Mendoza","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdulrahman","family":"Alzailaie","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianwei","family":"Yan","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clark R.","family":"Landis","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javen S.","family":"Weston","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering University of Tulsa  Tulsa OK 74104 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian P.","family":"Grady","sequence":"additional","affiliation":[{"name":"School of Sustainable Chemical Biological and Materials Engineering University of Oklahoma  Norman OK 73019 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7838-6893","authenticated-orcid":false,"given":"George W.","family":"Huber","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering University of Wisconsin\u2010Madison  Madison WI 53706 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,17]]},"reference":[{"key":"e_1_2_6_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2GC02588D"},{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adh1853"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4GC01013B"},{"key":"e_1_2_6_4_1","unstructured":"\u201cGreen Surfactants (Biosurfactants): A Petroleum\u2010Free Substitute for Sustainability\u2500Comparison Applications Market and Future Prospects|ACS Omega \u201d can be found under.https:\/\/pubs.acs.org\/doi\/full\/10.1021\/acsomega.3c00591(accessed 15 July 2025) n.d."},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/reactions2030015"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-12-809521-8.00013-1"},{"key":"e_1_2_6_7_1","unstructured":"J.Marsh \u201cPalm Oil Deforestation Is Getting Worse Here's What Needs to Happen \u201d can be found under.https:\/\/environment.co\/palm\u2010oil\u2010deforestation\/(accessed 15 July 2025) 2024."},{"key":"e_1_2_6_8_1","doi-asserted-by":"crossref","unstructured":"J.Wu Z.Jiang V. 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