Figure 16.

(a) Thiol–Michael addition reaction scheme to install RAFT functional groups into photopolymerizable acrylic oligomers. (b) Schematic of radical-mediated allyl sulfide bond-exchange mechanism through light-facilitated cleavage of a photoinitiator. (c) Example of the programming process starting from a polydomain 250 μm-thick film. The polymer was folded by hand and programmed with 320–500 nm (100 mW/cm²) coupled with gentle heating (30–40 °C). Subsequent thermal cycling resulted in the network unfolding at high temperatures and refolding on cooling. Adapted with permission from ref (87). Copyright 2018 AAAS.