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However, spider silk\u2010inspired fibers typically introduce \u03b2\u2010sheet\u2010like domains while neglecting microphase structure regulation, failing to overcome inherent strength\u2010toughness conflict. Herein, a spider silk\u2010inspired fiber is fabricated through a microphase engineering strategy by mimicking spidroin assembly process and microphase structure evolution during natural spider silk spinning. Polyurethane (PU) serves as raw material because its molecular structure closely resembles that of nature spidroin's architecture. Through a solvent exchange\u2010induced phase separation process, the long\u2010range oriented microphase structures are constructed. The as\u2010spun fiber achieves a high toughness of 626.14 \u00b1 38.01\u00a0MJ m\n                    <jats:sup>\u22123<\/jats:sup>\n                    , surpassing that of the strongest natural spider silk. Subsequently, post\u2010treatment is applied to induce crystallization, further increasing the tensile strength to 418.21 \u00b1 9.56\u00a0MPa while maintaining a high toughness of 333.09 \u00b1 20.64\u00a0MJ m\n                    <jats:sup>\u22123<\/jats:sup>\n                    . Notably, the spider silk\u2010inspired fiber can be used as an energy\u2010absorbing layer in a ballistic board due to its excellent energy dissipation capabilities, reducing deformation by 36.5% compared with a ceramic\u2010aramid control upon impact with a \u223c730\u00a0m s\n                    <jats:sup>\u22121<\/jats:sup>\n                    bullet. This work highlights the microphase engineering strategy in enhancing mechanical properties of fibers, offering a simple pathway to fabricate high\u2010performance spider silk\u2010inspired fibers.\n                  <\/jats:p>","DOI":"10.1002\/adma.75034","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T06:43:26Z","timestamp":1789541006000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Microphase Engineering Strategy for Spider Silk\u2010Inspired Fibers With Exceptional Strength, Toughness, and Damping Capacity"],"prefix":"10.1002","author":[{"given":"Wenhao","family":"Cheng","sequence":"first","affiliation":[{"name":"Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Changchun China"},{"name":"School of Applied Chemistry and Engineering University of Science and Technology of China  Hefei 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