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Visible Light–Induced RAFT Polymerization of Methacrylate with 4‐( N , N ‐diphenylamino)benzaldehyde as Organophotoredox Catalyst and the Effect of Temperature on the Polymerization
Author(s) -
Zhang Wenxiu,
Zhang Xianhong,
Ma Yuhong,
Chen Dong,
Yang Wantai
Publication year - 2019
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201900022
Subject(s) - polymer chemistry , polymerization , chain transfer , methyl methacrylate , dispersity , living polymerization , chemistry , ethylene glycol , raft , methacrylate , reversible addition−fragmentation chain transfer polymerization , monomer , photochemistry , materials science , radical polymerization , polymer , organic chemistry
With UV–vis absorption in the range of 270–435 nm, 4‐( N , N ‐diphenylamino)benzaldehyde (DPAB) takes efficient photoreduction quench with 4‐cynao‐4‐(phenylcarbonothioylthio)pentanoic acid (CTP). The polymerization rates of methyl methacrylate (MMA) are 0.019, 0.056, and 0.102 h −1 at 33, 40, and 50 °C, respectively, in the presence of DPAB and CTP under visible‐light irradiation. Dark reaction produces no PMMA at 50 °C for 120 h. The living feature is demonstrated by linearly increasing M n with the monomer conversions and narrow polydispersity index (PDI), chain extension, and block polymerizations with benzyl methacrylate (BnMA) and poly(ethylene glycol) monomethyl ether methacrylate (PEGMA). With PMMA‐CTP ( M n = 6800, PDI = 1.17), chain extension gives PMMA with M n = 15 900 and PDI = 1.15. With PMMA‐CTP ( M n = 6000, PDI = 1.21) as macro‐RAFT, PMMA‐ b ‐PBnMA of M n = 12 600 (PDI = 1.44) and M n = 18 500 (PDI = 1.31) are prepared. These results support that there is a positive synergistic effect between polymerization temperature and visible‐light irradiation on the photo‐RAFT without losing the living features.