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Nevertheless, industrial TPEs display a tradeoff between softness and strength, along with low upper service temperatures, typically \u2264100\u00a0\u00b0C. This limits their utility, such as in bio\u2010interfacial applications where supersoft deformation is required in tandem with strength, in addition to applications that require thermal stability (e.g., encapsulation of electronics, seals\/joints for aeronautics, protective clothing for firefighting, and biomedical devices that can be subjected to steam sterilization). Thus, combining softness, strength, and high thermal resistance into a single versatile TPE has remained an unmet opportunity. Through de novo design and synthesis of novel norbornene\u2010based\n                    <jats:bold>ABA<\/jats:bold>\n                    triblock copolymers, this gap is filled. Ring\u2010opening metathesis polymerization is employed to prepare TPEs with an unprecedented combination of properties, including skin\u2010like moduli (&lt;100\u00a0kPa), strength competitive with commercial TPEs (&gt;5\u00a0MPa), and upper service temperatures akin to high\u2010performance plastics (\u2248260\u00a0\u00b0C). Furthermore, the materials are elastic, tough, reprocessable, and shelf stable (\u22652 months) without incorporation of plasticizer. Structure\u2013property relationships identified herein inform development of next\u2010generation TPEs that are both biologically soft yet thermomechanically durable.\n                  <\/jats:p>","DOI":"10.1002\/adma.202402431","type":"journal-article","created":{"date-parts":[[2024,5,8]],"date-time":"2024-05-08T16:23:46Z","timestamp":1715185426000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Supersoft Norbornene\u2010Based Thermoplastic Elastomers with High Strength and Upper Service Temperature"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5693-3633","authenticated-orcid":false,"given":"Henry L.","family":"Cater","sequence":"first","affiliation":[{"name":"Department of Chemistry The University of Texas at Austin  Austin TX 78712 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