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However, the chemical recycling toolbox for polyethylene (PE), the most abundant type of plastic waste, remains underdeveloped. In this work, analytical methods were developed to explore the possibility to oxidatively convert PE into di\u2010carboxylic acids as reaction products. A multi\u2010analytical approach including gas chromatography\u2010mass spectrometry, gas chromatography\u2010flame ionization detection, several (2D) nuclear magnetic resonance methods as well as in\u2010situ transmission infrared spectroscopy was used. This led to a thorough qualitative and quantitative analysis on the product mixture, which extends and clarifies the existing literature. Without a catalyst (thermally) already up to 7\u2005mol\u2009% di\u2010carboxylic acids can be formed. Furthermore, it was found that the majority of the oxidized functionalities are carboxylic acids, (methyl) ketones, \u03b3\u2010lactones, \u03b3\u2010ketones and esters. An intra\u2010molecular hydrogen shift seemed key in the cleavage step and the formation of late\u2010stage side products. In addition, crosslinking reactions due to esterification reactions seem to limit the di\u2010carboxylic acid yield. Therefore, these two handles can be taken into account to study and design similar (catalytic) systems for the oxidative conversion of plastic waste.<\/jats:p>","DOI":"10.1002\/cssc.202301198","type":"journal-article","created":{"date-parts":[[2023,11,27]],"date-time":"2023-11-27T14:07:05Z","timestamp":1701094025000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Oxidative Conversion of Polyethylene Towards Di\u2010Carboxylic Acids: A Multi\u2010Analytical Approach"],"prefix":"10.1002","volume":"17","author":[{"given":"Tom J.","family":"Smak","sequence":"first","affiliation":[{"name":"Inorganic Chemistry and Catalysis group Debye Institute for Nanomaterials Science and Institute for Sustainable and Circular Chemistry Utrecht University  Universiteitsweg 99 3584 CG Utrecht The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"de Peinder","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry and Catalysis group Debye Institute for Nanomaterials Science and Institute for Sustainable and Circular Chemistry Utrecht University  Universiteitsweg 99 3584 CG Utrecht The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan C.","family":"Van der Waal","sequence":"additional","affiliation":[{"name":"TNO, Brightsite  Urmonderbaan 22 6167 RD Geleen The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rinke","family":"Altink","sequence":"additional","affiliation":[{"name":"TNO, Brightsite  Urmonderbaan 22 6167 RD Geleen The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ina","family":"Vollmer","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry and Catalysis group Debye Institute for Nanomaterials Science and Institute for Sustainable and Circular Chemistry Utrecht University  Universiteitsweg 99 3584 CG Utrecht The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5245-1426","authenticated-orcid":false,"given":"Bert M.","family":"Weckhuysen","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry and Catalysis group Debye Institute for Nanomaterials Science and Institute for Sustainable and Circular Chemistry Utrecht University  Universiteitsweg 99 3584 CG Utrecht The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,12,13]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"The Ellen MacArthur Foundation The New Plastics Economy: Rethinking the Future of Plastic & Catalysing Action 2013."},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.wasman.2017.07.044"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acssuschemeng.1c05013"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202104110"},{"key":"e_1_2_8_5_1","first-page":"627","volume":"3","author":"Remias J. 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