fig15

Figure 15. Mechanism for 1,4-photopolymerization of diacetylenes. (A) Array of diacetylene molecules. (B) An excited diradical monomer (red circles). (C) Coupling of the neighboring monomer (red arrows). (D) Diradical dimer. (E) Chain propagation reaction toward both sides until termination of reactive radicals (blue circles). Reprinted with permission from Ref.^[82], copyright 2019 American Chemical Society.