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However, the high resistance of PAs to many common solvents such as alcohols and hydrocarbons makes them difficult to recycle by dissolution under mild conditions. In this work, a formic acid (FA)\u2010based cosolvent system exhibiting synergistic solvation through hydrogen bonds and dispersive interactions is shown to rapidly dissolve long\u2010chain PAs such as PA11 and PA12 at room temperature, which is not possible in pure FA due to its long alkyl segment. The regenerated PA11 shows no change in chemical structures or properties, and sufficient selectivity toward PA allows for facile separation and recovery of non\u2010PA materials from mixtures and composites, such as polypropylene (layered films) and carbon fiber cloth (woven laminates). This cosolvent strategy has the potential to change the thermoplastic recycling landscape by facilitating low\u2010energy recycling protocols of long\u2010chain PAs commonly found in bio\u2010based varieties.\n                  <\/jats:p>","DOI":"10.1002\/cssc.70823","type":"journal-article","created":{"date-parts":[[2026,6,27]],"date-time":"2026-06-27T10:33:39Z","timestamp":1782556419000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Cosolvent\u2010Enhanced Dissolution of Long\u2010Chain Polyamides: Toward Room\u2010Temperature Material Recycling of Sustainable Composites"],"prefix":"10.1002","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0232-8240","authenticated-orcid":false,"given":"Jonathon","family":"Tanks","sequence":"first","affiliation":[{"name":"Research Center for Structural Materials National Institute for Materials Science (NIMS)  Tsukuba Ibaraki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6578-0923","authenticated-orcid":false,"given":"Kenji","family":"Tamura","sequence":"additional","affiliation":[{"name":"Research Center for Electronic and Optical Materials National Institute for Materials Science (NIMS)  Tsukuba Ibaraki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,27]]},"reference":[{"key":"e_1_2_9_2_1","unstructured":"Research and Markets \u201cGlobal Nylon Market Size Share & Trends Analysis Report by Product (Nylon 6 Nylon 66) by Application (Automobile Electrical & Electronics Engineering Plastics Textiles) by Region and Segment Forecasts 2021\u20102028 \u201d2022 accessed December 26 2025 https:\/\/www.researchandmarkets.com\/reports\/4375423\/global\u2010nylon\u2010market\u2010size\u2010share\u2010and\u2010trends."},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2020.12.027"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41893-022-01054-9"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/9781118676646.ch10"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/app.51017"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2022.135361"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41893-024-01298-7"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41893-023-01236-z"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.polymdegradstab.2024.110773"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-023-44314-0"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesb.2015.03.038"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/app.55195"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.3c00739"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2023.10.022"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1021\/acssuschemeng.0c05706"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2023.145333"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.0c05675"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2GC02588D"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/pol.20230154"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.susmat.2022.e00562"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/pen.11225"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1002\/app.11147"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1039\/D0GC00647E"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1002\/cssc.202401470"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2023.167586"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1021\/acssuschemeng.7b03282"},{"key":"e_1_2_9_28_1","unstructured":"A.Maeurer M.Schlummer andO.Beck 2008. 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