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Experimental and computational investigation of oxidative quenching governed aqueous organocatalyzed atom transfer radical polymerization.
- Source :
-
Chemical Engineering Journal . Apr2019, Vol. 362, p721-730. 10p. - Publication Year :
- 2019
-
Abstract
- Graphical abstract Highlights • An organic photoredox catalyst was developed for aqueous organocatalyzed ATRP. • Faster rate and higher initiator efficiency than its counterpart were observed. • Difference of oxidative and reductive quenching cycle was studied via kinetic model. • Current system enabled the polymerization through a "green" and sustainable way. Abstract A water-soluble organic photoredox catalyst, 3,7-methoxypolyethylene glycol 1-naphthalene-10-phenoxazine (Naph-PXZ-PEG), that can catalyze aqueous organocatalyzed atom transfer radical polymerization (ATRP) via oxidative quenching cycle has been reported for the first time. Comparative studies of Naph-PXZ-PEG and EosinY involved aqueous organocatalyzed ATRP systems have been done via polymerization experiment and kinetic modeling approach. Results showed that the polymerization via oxidative quenching cycle in Naph-PXZ-PEG system proceeded much faster and higher initiator efficiency than the polymerization via reductive quenching cycle in Eosin Y system under same conditions. Detailed information of the Naph-PXZ-PEG was presented by experiments and density functional theory (DFT) simulation. A series of kinetics experiments under different catalyst loadings, initiator concentrations, "on-off" switch of light and chain extension have been conducted and confirmed the good controllability of the current system and high end-group fidelity. This work provides a systematic study on developing an effective water soluble organic catalyst for the preparation of the well-defined polymers by a "green" and sustainable ATRP. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 362
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 134378796
- Full Text :
- https://doi.org/10.1016/j.cej.2019.01.087