PET-RAFT Polymerization Catalyzed by Small Organic Molecule under Green Light Irradiation

Abstract

Photocatalyzed polymerization using organic molecules as catalysts has attracted broad interest because of its easy operation in ambient environments and low toxicity compared with metallic catalysts. In this work, we reported that 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DTBT) can act as an efficient photoredox catalyst for photoinduced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization under green light irradiation. Well-defined (co)polymers can be obtained using this technique without any additional additives like noble metals and electron donors or acceptors. The living characteristics of polymerization were verified by kinetic study and the narrow dispersity (Đ) of the produced polymer. Excellent chain-end fidelity was demonstrated through chain extension as well. In addition, this technique showed great potential for various RAFT agents and monomers including acrylates and acrylamides.

Blue light-induced iniferter RAFT polymerization in aqueous-alcoholic media as a universal tool for the homopolymerization of various monomer families: kinetic investigations on different scales

“…The same observation was made in the PET-RAFT polymerization by green light irradiation of these two monomers. 53 As observed for the polymerization of DMA, light-induced polymerization of DMAEA also proceeds in a first order fashion up to 2 h polymerization time (see Fig. 4(b)).…”

Orthogonal synthesis and modification of hyperbranched polymers via different colors of light

“…2-(n-Butyltrithiocarbonate)-propionic acid (BTPA) were synthesized according to literature 35 and characterized by 1 H NMR spectroscopy (Figure S1).…”

“…Monomers, methyl acrylate (%99, Sigma Aldrich) and 2‐hydroxyethyl acrylate (HEA, 96% Sigma Aldrich) were purified using a simple column. 2‐( n ‐Butyltrithiocarbonate)‐propionic acid (BTPA) were synthesized according to literature 35 and characterized by 1 H NMR spectroscopy (Figure S1).…”

Photocontrolled RAFT polymerization: past, present, and future

“…Thus far, perylene, 216 benzaldehyde, 217–219 benzothiadiazole, 220 PheoA, 106 reduced free base porphyrin, 221 fluorophenyl bacteriochlorin, 222 self-assembled carboxylated porphyrin (SA-TCPP), 223 g-C 3 N 4 , 143,144,224,225 poly(1,4-diphenylbutadiyne)-nanofibers (PDNB-NF), 226 imine-based COFs, 227 and (heteroatom-doped) carbon dots 228 have been reported as organic PCs. Among them, SA-TCPP, g-C 3 N 4 , imine-based COFs, and PDPB-NF were heterogeneous, so they can be separated after the polymerization and reused several times.…”