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(a) Chemical structures of mesogenic and isotropic monomers. (b) Mechanism and illustration of the urethane bond-exchange reaction via transcarbamoylation. (c) Multireversible shape change, where a load-free strain was actuated by isotropic–nematic (shape 1 to shape 2) and nematic–smectic phase transitions (shape 2 to shape 3) upon thermal cycling. Adapted with permission from ref (94). Copyright 2018 American Chemical Society.
