Abstract:
A heterogeneous photocatalyst TPPF
20-TPA based on 5, 10, 15, 20-tetrakis (pentafluorophenyl) porphyrin (TPPF
20) was synthesized, which could be used in photo-induced electron/energy transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization under the radiation of blue light (
λmax = 425 nm). A series of polymers with defined molecular weights and low dispersion could be obtained through the PET-RAFT polymerization process. The monomer conversion rate and the polymer molecular weight were detected by
1H-NMR and GPC. Through these experiments, the reaction process of the catalyst was compared under different light sources, different monomer relative concentrations or different monomer conditions. The results showed that TPPF
20-TPA could catalyze the polymerization of common monomers (MMA,GMA,B
ZMA), making the reaction process controllable, and its insolubility in common solvents (e.g. ethanol, dichloromethane, dimethyl sulfoxide) could be used for 3 independent PET-RAFT polymerizations reactions without significant reduction in polymerization efficiency.