Various block copolymers in which the blocks are held together by a photocleavable junction have been synthesized via a one-pot simultaneous ATRP-CuAAC "click" reaction process, and their easy photocleavage has been demonstrated.
Schumers, J.-M., Gohy, J.-F., & Fustin, C.-A. (2010). A versatile strategy for the synthesis of block copolymers bearing a photocleavable junction. Polymer Chemistry, 1(2), 161-163. https://doi.org/10.1039/b9py00218a (Original work published 2010)