{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T08:13:14Z","timestamp":1781079194888,"version":"3.54.1"},"reference-count":31,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2026,1,12]],"date-time":"2026-01-12T00:00:00Z","timestamp":1768176000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"\u201cPioneer\u201d and \u201cLeading Goose\u201d R&D Program of Zhejiang","award":["2024SSYS0082"],"award-info":[{"award-number":["2024SSYS0082"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomimetics"],"abstract":"<jats:p>Designing the high-performance polyimides (PIs) for the biomimetic structures, which are used in extreme conditions, remains greatly challenging, due to the conflict between processability and thermal stability. Here, we report a series of silicon\u2013alkyne-functionalized diamine-based polyimides that exhibit remarkable processability and thermal stability. The incorporation of bulky siloxy groups disrupts chain packing and increases free volume, enabling excellent solubility in polar solvents, while the rigid fluorene core enhances chain stiffness. DFT calculations confirm twisted molecular geometries (Si bond angle \u2248 103\u00b0, dihedral angle \u2248 89\u00b0) which weak \u03c0\u2013\u03c0 stacking, while heterogeneous electrostatic potentials enable favorable noncovalent interactions (e.g., C\u2013F\u00b7\u00b7\u00b7H\u2013C), promoting solvent diffusion. After thermal curing, the obtained product shows a high decomposition temperature (Td5% = 560 \u00b0C), char yield of 72.0% at 800 \u00b0C, and glass transition temperature (Tg) of 354.6 \u00b0C. Meanwhile, locally planar fluorene units retain inherent thermal stabilization benefits through constrained rotational mobility. These results demonstrate a spatially decoupled siloxy\u2013alkyne design that synergistically enhances molecular flexibility, disorder, and electronic stability, offering a molecular strategy for tailoring PI-based matrices to meet the demands of emerging biomimetic architectures and other high-performance composites operating under severe thermal loads.<\/jats:p>","DOI":"10.3390\/biomimetics11010061","type":"journal-article","created":{"date-parts":[[2026,1,12]],"date-time":"2026-01-12T09:13:01Z","timestamp":1768209181000},"page":"61","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["High-Performance Polyimides with Enhanced Solubility and Thermal Stability for Biomimetic Structures in Extreme Environment"],"prefix":"10.3390","volume":"11","author":[{"given":"Jichao","family":"Chen","sequence":"first","affiliation":[{"name":"Tianmushan Laboratory, Hangzhou 310023, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiping","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyong","family":"Ma","sequence":"additional","affiliation":[{"name":"Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijian","family":"Wang","sequence":"additional","affiliation":[{"name":"Tianmushan Laboratory, Hangzhou 310023, China"},{"name":"Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8614-5179","authenticated-orcid":false,"given":"Yizhuo","family":"Gu","sequence":"additional","affiliation":[{"name":"Tianmushan Laboratory, Hangzhou 310023, China"},{"name":"Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e2105299","DOI":"10.1002\/adma.202105299","article-title":"Double-layer nacre-inspired polyimide-mica nanocomposite films with excellent mechanical stability for LEO environmental conditions","volume":"33","author":"Pan","year":"2022","journal-title":"Adv. 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