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Synthesis of Poly( N ‐isopropylacrylamide)‐ Block ‐Poly( tert ‐Butyl Methacrylate) Block Copolymer by Visible Light–Induced Metal‐Free Atom Transfer Polymerization
Author(s) -
Xu YangYang,
Li Gaocan,
Hu Yanfei,
Wang Yunbing
Publication year - 2018
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.201800192
Subject(s) - atom transfer radical polymerization , copolymer , polymer chemistry , poly(n isopropylacrylamide) , polymerization , dispersity , reversible addition−fragmentation chain transfer polymerization , monomer , radical polymerization , chain transfer , chemistry , living free radical polymerization , materials science , organic chemistry , polymer
Atom transfer radical polymerization (ATRP) is one of the most powerful methodologies for polymerization. Well‐controlled ATRP of N ‐isopropylacrylamide (NIPAAm) could be obtained in organic‐water mixture solvent with conventional metal catalyst/ligand catalyst system. However, the mixture solvent is not suitable for copolymerization of NIPAAm with hydrophobic monomers. Moreover, further purification of metal was required for biomedical polymerization. Here, poly( N ‐isopropylacrylamide) (PNIPAAm) is synthesized by visible light–induced metal‐free ATRP using a photoredox catalyst. PNIPAAm is obtained with high conversion and controlled molecular weight with low dispersity. Moreover, poly( N ‐isopropylacrylamide)‐ block ‐poly( tert ‐butyl methacrylate) (PNIPAAm‐ b ‐PMAA) block copolymer can be synthesized by such metal‐free ATRP. PNIPAAm‐ b ‐PMAA can be obtained by following hydrolysis.