期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202200855
关键词
ATRP; green light; oxygen tolerance; water
资金
- Fonds de recherche du Quebec (FRQNT)
- NSF
- [301734]
- [CHE 2000391]
- [DMR-2202747]
This study demonstrates the ATRP of OEOMA(500) in water using CuBr2 and TPMA as catalysts under blue or green-light irradiation without the need for additional reagents or deoxygenation. The choice of TPMA supplier and purity significantly affect the reaction outcome.
Atom transfer radical polymerization (ATRP) of oligo(ethylene oxide) monomethyl ether methacrylate (OEOMA(500)) in water is enabled using CuBr2 with tris(2-pyridylmethyl)amine (TPMA) as a ligand under blue or green-light irradiation without requiring any additional reagent, such as a photo-reductant, or the need for prior deoxygenation. Polymers with low dispersity (D = 1.18-1.25) are synthesized at high conversion (>95%) using TPMA from three different suppliers, while no polymerization occurred with TPMA is synthesized and purified in the laboratory. Based on spectroscopic studies, it is proposed that TPMA impurities (i.e., imine and nitrone dipyridine), which absorb blue and green light, can act as photosensitive co-catalyst(s) in a light region where neither pure TPMA nor [(TPMA)CuBr](+) absorbs light.
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