Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 48, Pages 17474-17479Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201911612
Keywords
liquid crystalline thermosets; reprogramming and welding; stable alignment; time-temperature equivalence principle; transesterification
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Funding
- National Natural Science Foundation of China [51722303, 21674057, 21805159, 21788102]
- China Postdoctoral Science Foundation [2018T110086, 2017M620735]
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Widely used traditional thermosets are good candidates for construction of 3D soft actuators because of their excellent stability; however, it is generally acknowledged that they cannot be reprocessed. The time-temperature equivalence principle enables reprocessing of traditional liquid crystalline epoxy thermosets (LCETs) into 3D soft actuators. Even though the transesterification reaction of LCETs is extremely slow, it is fast enough to induce a topology rearrangement and subsequent reprocessing when prolonging the transesterification time according to aforementioned principle. Therefore, LCETs can be aligned by a simple procedure. The alignment is quite stable at high temperature and remains after more than 1000 heating-cooling actuation cycles. The resulting 3D soft actuators are remouldable, reprogrammable, reconfigurable, weldable, self-healable, recyclable, and stable, which is impossible for any traditional thermosets and is therefore a compelling advance in terms of the applications open to 3D soft actuators.
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