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. 2018 Jan 26;4(1):eaao3865. doi: 10.1126/sciadv.aao3865

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 1 — (A) Synthetic route for the polyurethane network. (B) Thermally induced transesterification and transcarbamoylation and photo-reversible dimerization of nitro-cinnamate. (C) Mechanisms for permanent shape reconfiguration via solid-state thermal plasticity. (D) Reversible actuation via photo-defined reversible shape memory behavior. Scale bars, 1 cm.