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By a combination of multiscale experiments and atomistic simulations, a transparent unfilled elastomer with simultaneously enhanced toughness and stiffness is demonstrated. The designed elastomer comprises homogeneous networks with ultrastrong, reversible, and sacrificial octuple hydrogen bonding (HB), which evenly distribute the stress to each polymer chain during loading, thus enhancing stretchability and delaying fracture. Strong HBs and corresponding nanodomains enhance the stiffness by restricting the network mobility, and at the same time improve the toughness by dissipating energy during the transformation between different configurations. In addition, the stiffness mismatch between the hard HB domain and the soft poly(dimethylsiloxane)\u2010rich phase promotes crack deflection and branching, which can further dissipate energy and alleviate local stress. These cooperative mechanisms endow the elastomer with both high fracture toughness (17016 J m\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) and high Young's modulus (14.7\u00a0MPa), circumventing the trade\u2010off between toughness and stiffness. This work is expected to impact many fields of engineering requiring elastomers with unprecedented mechanical performance.\n                  <\/jats:p>","DOI":"10.1002\/adma.202008523","type":"journal-article","created":{"date-parts":[[2021,5,3]],"date-time":"2021-05-03T04:07:59Z","timestamp":1620014879000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":220,"title":["Simultaneously Toughening and Stiffening Elastomers with Octuple Hydrogen Bonding"],"prefix":"10.1002","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1415-3561","authenticated-orcid":false,"given":"Yizhi","family":"Zhuo","sequence":"first","affiliation":[{"name":"NTNU Nanomechanical Lab Department of Structural Engineering Norwegian University of Science and Technology (NTNU)  Trondheim 7491 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijie","family":"Xia","sequence":"additional","affiliation":[{"name":"National 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