A Synthetic and Multispectroscopic Speciation Analysis of Controlled Radical Polymerization Mediated by Amine–Bis(phenolate)iron Complexes
2015
The mechanism of reversible-deactivation radical polymerization (RDRP) mediated by chloro-substituted amine–bis(phenolate)iron complexes was studied via a combination of Mossbauer, EPR, NMR, and online Vis/NIR spectroscopy. It was found that styrene polymerization operates via an atom-transfer radical polymerization (ATRP) mechanism when alkyl halide is present, whereas an interplay between ATRP and organometallic-mediated radical polymerization (OMRP) equilibria occurs during MMA polymerization. The preparation of the amine–bis(phenolate)iron(II) complex, [O2NN′]FeII, allowed polymerizations to be performed under an OMRP-only regime free of alkyl halide that yields dispersities as low as 1.29 for MMA polymerization.
Keywords:
- Photochemistry
- Living free-radical polymerization
- Reversible addition−fragmentation chain-transfer polymerization
- Chain transfer
- Ionic polymerization
- Organic chemistry
- Cobalt-mediated radical polymerization
- Radical polymerization
- Inorganic chemistry
- Nitroxide mediated radical polymerization
- Polymerization
- Chemistry
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