The reversible addition-fragmentation chain transfer (RAFT) polymerization of 1-(4-(4,5-diphenyl-1H-imidazol-2-yl)phenyl)-4-vinyl-1H-1,2,3-triazole (DVT) was carried out in N,N-dimethylformamide at 70 degrees C using 2-(ethylthiocarbonothioylthio)-2-methylpropanoic acid as the RAFT agent and 2,2'-azobisisobutyronitrile as the initiator to give well-defined poly(DVT) (1). The cross-linking reaction of the obtained (1) was proceeded with K-3[Fe(CN)(6)] and KOH, yielding the intramolecular (2) and intermolecular cross-linked poly( DVT) (3) by tuning the polymer concentrations. The resulting cross-linked poly(DVT) (2) and (3) were de-cross-linked by visible light irradiation in the presence of ethanethiol, giving ethylthio-capped, de-cross-linked poly(DVT) (4) in good yield. (C) 2016 Elsevier Ltd. All rights reserved.