Fig. 3

a Representative poly(meth)acrylate linear homopolymers of AB that show photoinduced transitions between glass and liquid states. b Photoinduced glass–liquid transitions of an AB homopolymer (R1 = H, m = 6, R2 = CH3). c Photoinduced transitions between the liquid E isomer and the physically cross-linked solid-like Z isomer using an AB monomer fused with a quadruple hydrogen bonding ureidopyrimidinone moiety. d Healing of the AB homopolymer bulk material with UV and visible light irradiation (R1 = H, m = 6, R2 = CH3). Reproduced with permission from Zhou et al. [132]. Copyright 2017, Springer Nature