SET-LRP of semifluorinated acrylates and methacrylates

Single electron transfer-living radical polymerization (SET-LRP) of 1H, 1H, 2H, 2H-perfluorooctyl acrylate, 2,2,3,3,4,4,4-heptafluorobutyl acrylate, and 1H, 1H, 5H-octafluoropentyl methacrylate up to [M](0)/[I](0) = 30 and 1H, 1H, 5H-octafluoropentyl acrylate up to 93% monomer conversion targeting [M](0)/[I](0) = 260 with excellent control of molecular weight and molecular weight distribution was accomplished in 2,2,2-trifluoroethanol (TFE) at 25 degrees C for the acrylates and 50 degrees C for the methacrylate. These experiments demonstrated that TFE serves as a very good solvent for SET-LRP of semifluorinated monomers using hydrazine activated Cu(0) wire as a catalyst, bis(2-bromopropionyl) ethane and p-toluene sulfonyl chloride as initiators, and Me-6-TREN as a ligand. Analysis of the kinetics of polymerization and of the polymer chain ends by a combination of H-1-NMR, GPC, MALDI-TOF and chain-end functionalization by "thio-bromo" click reaction demonstrated the synthesis of perfect or near-perfect chain-end functional semifluorinated homopolymers.