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Herein, we report rigid\u2013flexible interpenetrating polymer networks (IPNs) constructed from a poly(urethane\u2013urea) (PUU) prepolymer and an epoxy resin (EP) prepolymer through a solvent-free, one-pot casting process. The optimized formulation, PUU75EP25, delivers a tensile strength of 60.41 MPa and a toughness of 260.35 MJ m\u20133 and attenuates 81% of the blast shock wave peak overpressure, ranking among the highest values reported for polymeric materials. Split Hopkinson pressure bar tests at a strain rate of 3200 s\u20131 reveal that PUU75EP25 combines the highest energy absorption efficiency (\u03b7 \u2248 0.93) with a stable flow-stress plateau up to a true strain of 0.95, demonstrating efficient energy absorption under blast-relevant dynamic loading. In the Sprague\u2013Dawley (SD) rat model, PUU75EP25 achieved a 100% survival rate (vs. 60% for the unprotected group) and reduced the lung injury area from 85.21% (unprotected group) to 16.71% (vs. 46.22% for poly(urethane\u2013urea) protection). This high attenuation arises from the coupling of microscopic dissipation (sacrificial hydrogen-bond breakage and stress-wave scattering at the microphase-separated interfaces) with a macroscopic large-deformation zone that absorbs the shock energy through stable, failure-free deformation. This work establishes network interpenetration as a simple, scalable design principle for blast-protective polymers.<\/jats:p>","DOI":"10.1021\/acsami.6c17244","type":"journal-article","created":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T11:01:37Z","timestamp":1792148497000},"page":"58429-58440","source":"Crossref","is-referenced-by-count":0,"title":["Interpenetrating Poly(urethane\u2013urea)\/Epoxy Networks for Superior Blast Shock Wave Attenuation"],"prefix":"10.1021","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-3771-0762","authenticated-orcid":true,"given":"Hongwei","family":"Ruan","sequence":"first","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyu","family":"Fan","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan","family":"Du","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaodong","family":"Zhao","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jintao","family":"Xu","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhuangqing","family":"Fan","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhikang","family":"Liao","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ling","family":"Zeng","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianxin","family":"Jiang","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anqiang","family":"Zhang","sequence":"additional","affiliation":[{"name":"Daping Hospital, Army Medical University , , ,","place":["Chongqing, China, 400042"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,16]]},"reference":[{"key":"2026102805082308500_cit1","doi-asserted-by":"publisher","first-page":"91","DOI":"10.1016\/j.dt.2024.03.006","article-title":"Blast Injury Risks to Humans within a Military Trench","volume":"40","author":"Edri","year":"2024","journal-title":"Def. 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