{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T16:05:10Z","timestamp":1790784310526,"version":"4.1.0"},"reference-count":43,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T00:00:00Z","timestamp":1790467200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T00:00:00Z","timestamp":1790467200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["advanced.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Advanced Science"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>The trade\u2010off between crosslink density and segment mobility challenges bio\u2010based epoxy vitrimers to simultaneously achieve high mechanical robustness and dynamic adaptability. Here, we report that engineering the fractional free volume serves as an effective structural parameter to decouple this longstanding conflict. By designing bifunctional and trifunctional epoxy monomers from renewable resources, we construct dynamic networks integrating rigid conjugated Schiff bases with flexible siloxane segments, enabling deliberate manipulation of free volume characteristics within the hybrid architecture. Molecular dynamics simulations reveal that the bifunctional system, which possesses a moderately higher fractional free volume, simultaneously achieves high crosslink density and enhanced segmental mobility. This unique combination promotes efficient stress dissipation and accelerates bond exchange kinetics, successfully reconciling strength and toughness without compromising network dynamics. Consequently, the optimized vitrimer exhibits exceptional mechanical properties alongside rapid stress relaxation and self\u2010healing capability. When employed as a composite matrix, it enables non\u2010destructive carbon fiber recovery, as well as adhesive\u2010free welding and thermoforming. This work establishes fractional free volume as a practical design lever for creating high\u2010performance, sustainable covalent adaptable networks, thereby providing a route from empirical toughening toward topology\u2010directed property optimization.<\/jats:p>","DOI":"10.1002\/advs.77917","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T18:00:31Z","timestamp":1790532031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Performance Bio\u2010Based Epoxy Vitrimers and Composites: Synergizing Robustness and Reprocessability via Fractional Free Volume Regulation"],"prefix":"10.1002","author":[{"given":"Kai","family":"Dong","sequence":"first","affiliation":[{"name":"Key Laboratory of High Performance Plastics Ministry of Education College of Chemistry Jilin University  Changchun People's Republic of 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