Photo-induced complex shape transformations. (a) Monomers and reaction mechanism for the addition–fragmentation chain transfer within the
polymer backbone; (b) Mechanism of the mechanophotopatterning: the material is uniaxially stretched and UV irradiated though a mask; (c) The hexagonal
pattern obtained after process (b) (scale bar = 1 mm) [221], Copyright 2011. Reprinted with permission from John Wiley and Sons; (e) Synthesis of the
semicrystalline polydisulfide network; (f) Visual demonstrations showing the reprogrammable shape memory properties of the polydisulfide network: (1
and 2). A flat specimen is fixed into a helical shape and subsequently recovered to the permanent flat shape; (3). The permanent shape of the film can be
photo-reprogrammed by holding it in the helical shape while exposing it to UV light; (4 and 5). Programming and recovery of the new permanent shape
[223], Copyright 2013. Reprinted with permission from the American Chemical Society.