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- W2072847765 abstract "This work describes a facile removal/modification of thiocarbonylthio end groups of RAFT-made polymers by the utilization of zero-valent copper (Cu(0)) powder/2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) under mild conditions, especially for poly(methyl methacrylate) (PMMA). At [PMMA]0/[Cu(0)]0/[ligand]0/[TEMPO]0 = 1/5/5/1.5, the molecular weights (MWs) gradually increased to twofold that of the precursor, due to the polymeric radical–polymeric radical cross coupling. While the MW remained unchanged at [PMMA]0/[Cu(0)]0/[ligand]0/[TEMPO]0 = 1/5/5/5, generating vinyl group terminated telechelic polymers via a polymeric radical–TEMPO disproportionation process. The utilization of Cu(0) wire can also remove the thiocarbonylthio end group effectively. Zero-valent iron (Fe(0)) (powder or wire) can be applied to remove/modify the thiocarbonylthio end group instead of Cu(0)/ligand with comparable results. This work provided an alternative and promising approach for an adjustable end group removal/modification of RAFT polymers, and would eventually strengthen and facilitate the potential large-scale application of RAFT-related polymers." @default.
- W2072847765 created "2016-06-24" @default.
- W2072847765 creator A5013617244 @default.
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- W2072847765 date "2013-01-01" @default.
- W2072847765 modified "2023-10-16" @default.
- W2072847765 title "Zero-valent metal catalyzed radical-induced adjustable removal/modification of thiocarbonylthio end groups of RAFT polymer at ambient temperature" @default.
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- W2072847765 doi "https://doi.org/10.1039/c2py20667f" @default.
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