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We present a synergistic strategy that couples hydrazone\u2010linked covalent organic framework (H\u2010COF) nanoconfinement with UV\u2010triggered cross\u2010linking to realize self\u2010strengthening poly(urea\u2010urethane) (PUU) elastomers. H\u2010COF nanochannels provide abundant H\u2010bonding sites that immobilize chains and restrict mobility; upon UV irradiation, terminal C = C groups undergo confined radical polymerization within these channels, installing covalent cross\u2010links precisely in highly dynamic regions. This cooperative mechanism strengthens the network while preserving the dissipation of H\u2010bonds, yielding a 3.01\u00d7 increase in tensile strength (85.1\u00a0MPa), a 2.10\u00d7 enhancement in toughness (327.27 MJ\u2022m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>3<\/jats:sup>\n                    ), and a 2.20\u00d7 improvement in fracture energy (303.65 kJ\u2022m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    ). Microstructural analysis reveals reduced domain spacing and homogenized morphology, while digital image correlation demonstrates suppressed strain localization. Moreover, UV irradiation shortens the shape\u2010memory recovery time (R\n                    <jats:sub>r<\/jats:sub>\n                    up to 99.06%) and intensifies fluorescence, providing a direct optical signal of the recovery process. This work establishes a generalizable design principle for stimuli\u2010programmed self\u2010strengthening under nanoconfinement, advancing elastomers toward adaptive durability.\n                  <\/jats:p>","DOI":"10.1002\/adma.202517083","type":"journal-article","created":{"date-parts":[[2026,4,2]],"date-time":"2026-04-02T15:56:08Z","timestamp":1775145368000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Synergistic Nanoconfinement and UV Crosslinking Enabling Self\u2010Strengthening, Ultra\u2010Robust Shape\u2010Memory Elastomers"],"prefix":"10.1002","volume":"38","author":[{"given":"Jing","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences  Lanzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianze","family":"Chen","sequence":"additional","affiliation":[{"name":"State 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