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Rapid Commun."],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The segmental compatibility between soft and hard segments, along with the resulting microphase separation behavior, critically influences the mechanical and thermal properties of polyurethane elastomers (PU). In this work, we propose a steric hindrance\u2010based molecular design strategy to regulate the microphase structure of nonpolar polybutadiene\u2010based PU. Multiscale characterization and molecular simulations reveal that introducing chain extenders with moderate steric hindrance effectively disrupts the ordered packing of hard segments. This leads to the formation of an interfacial transition\u2010type microphase separation (ITMS) structure. The unique interfacial state enhances interfacial compatibility and morphological uniformity, thereby improving tensile strength, toughness, and energy dissipation. The optimized sample, PU\u20102, achieved a tensile strength of 14.3\u00a0MPa, a toughness of 23.5 MJ\u00b7m\n                    <jats:sup>\u22123<\/jats:sup>\n                    , and tan \u03b4\n                    <jats:sub>max<\/jats:sub>\n                    above 1.0. It also exhibited stable performance under dynamic loading, together with water resistance, electrical insulation, and biocompatibility. These results highlight ITMS as a design strategy for optimizing PU with nonpolar soft and rigid hard segments.\n                  <\/jats:p>","DOI":"10.1002\/marc.202500727","type":"journal-article","created":{"date-parts":[[2025,10,20]],"date-time":"2025-10-20T03:29:04Z","timestamp":1760930944000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Steric Hindrance\u2010Induced Microphase Structure Evolution and Synergistic Performance Optimization of High\u2010Performance Polybutadiene\u2010Based Polyurethane Elastomers"],"prefix":"10.1002","volume":"47","author":[{"given":"Yushu","family":"Tian","sequence":"first","affiliation":[{"name":"State Key Laboratory of Organic\u2010Inorganic Composites College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing P. R. 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