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In this work, we report an ecofriendly and efficient mechanochemical strategy for upcycling of bio\u2010 and fossil\u2010based polyesters under mild conditions into synthetically useful building blocks. Bio\u2010based polyethylene furanoate (PEF), polybutylene furanoate (PBF), and polylactic acid (PLA), as well as fossil\u2010derived polyethylene terephthalate (PET), were successfully transformed into their corresponding transesterification and amidation products in excellent yields using sodium methoxide as a catalyst. These reactions generate the corresponding diol, methanol, and sodium chloride as byproducts, which can be recovered and reused. Furthermore, using the same protocol, PEF was converted into bio\u2010based plasticizers, including diethylhexyl furanate (DEHF) and diisoamyl furanoate (DIAF) in excellent yields. Importantly, the method is not limited to pure polymers but is also effective for commercially available PET\u2010 and PLA\u2010based packaging materials. The products were isolated by simple aqueous workup and characterized using NMR, IR, HRMS, and XRD techniques. Overall, this mechanochemical route offers a sustainable, cost\u2010effective, and versatile approach for polyester waste valorization, contributing significantly to a circular plastic economy.<\/jats:p>","DOI":"10.1002\/cssc.70975","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T17:39:26Z","timestamp":1788197966000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Solvent\u2010Free Approach for the Mechanochemical Upcycling of Bio\u2010 and Fossil\u2010Based Polyesters Into Value\u2010Added Chemicals and Bio\u2010Based Plasticizers"],"prefix":"10.1002","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-3972-785X","authenticated-orcid":false,"given":"Divya","family":"Jain","sequence":"first","affiliation":[{"name":"Leibniz Institute for Catalysis (LIKAT Rostock)  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3508-0683","authenticated-orcid":false,"given":"Nora","family":"Jannsen","sequence":"additional","affiliation":[{"name":"Leibniz Institute for Catalysis (LIKAT Rostock)  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8017-0322","authenticated-orcid":false,"given":"Riko","family":"Siewert","sequence":"additional","affiliation":[{"name":"Lehrstuhl f\u00fcr Technische Thermodynamik Universit\u00e4t Rostock  Rostock Germany"},{"name":"Department Life, Light &amp; Matter, Faculty of Interdisciplinary Research University of Rostock  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4002-7019","authenticated-orcid":false,"given":"Dzmitry","family":"Zaitsau","sequence":"additional","affiliation":[{"name":"Lehrstuhl f\u00fcr Technische Thermodynamik Universit\u00e4t Rostock  Rostock Germany"},{"name":"Department Life, Light &amp; Matter, Faculty of Interdisciplinary Research University of Rostock  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0133-303X","authenticated-orcid":false,"given":"Hans\u2010Joachim","family":"Drexler","sequence":"additional","affiliation":[{"name":"Leibniz Institute for Catalysis (LIKAT Rostock)  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2416-8874","authenticated-orcid":false,"given":"Torsten","family":"Beweries","sequence":"additional","affiliation":[{"name":"Leibniz Institute for Catalysis (LIKAT Rostock)  Rostock Germany"},{"name":"Department Life, Light &amp; Matter, Faculty of Interdisciplinary Research University of Rostock  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,31]]},"reference":[{"key":"e_1_2_8_2_1","unstructured":"H.Ritchie V.Samborska andM.Roser \u201cPlastic Pollution \u201d2023 accessed February 16 2026 https:\/\/ourworldindata.org\/plastic-pollution."},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0281596"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.clema.2024.100220"},{"key":"e_1_2_8_5_1","unstructured":"World Analysis \u2013 Polyester World Analysis \u2010 Polyester \u2010 Chemical Market Analytics By OPIS a Dow Jones Company accessed February 16 2026 https:\/\/chemicalmarketanalytics.com\/products\/wa-polyester\/."},{"key":"e_1_2_8_6_1","unstructured":"Polyester market Size Share Growth and Industry Analysis By Type (Polyester Staple Fiber (PSF) Viscose Staple Fibers (VSF) Paraxylene (PX) Purified Terephthalic Acid (PTA) Mono\u2010ethylene Glycol (MEG) others) By Application (Industry Textile Medical Textile Home Textile Spinning Clothing) And Regional Forecast To 2035. 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