Malleable and Recyclable Poly(urea-urethane) Thermosets bearing Hindered Urea Bonds.

Zhang, Yanfeng; Ying, Hanze; Hart, Kevin R; Wu, Yuxiao; Hsu, Aaron J; Coppola, Anthony M; Kim, Tae Ann; Yang, Ke et al. · Adv Mater · 2016

basic_science · Level V

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Abstract

Poly(urea-urethane) thermosets containing the 1-tert-butylethylurea (TBEU) structure feature a reversible dissociation/association process of their covalent linkages under mild conditions. Unlike conventional thermosets, TBEU-based poly(urea-urethane) thermosets maintain their malleability after curing. Under high temperature (100 °C) and applied pressure (300 kPa), ground TBEU thermoset powder can be remolded to bulk after 20 min.