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Preparation of Photoactive Polymers and Postmodification via Nitroxide Trapping Under UV Irradiation
Author(s) -
Mardyukov Artur,
Studer Armido
Publication year - 2013
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201200595
Subject(s) - nitroxide mediated radical polymerization , gel permeation chromatography , polymer , polymer chemistry , polymerization , radical , photochemistry , chemistry , copolymer , conjugated system , fourier transform infrared spectroscopy , radical polymerization , organic chemistry , chemical engineering , engineering
New types of photoactive homo and block copolymers bearing α−hydroxyalkylphenylketone (2‐hydroxy‐2‐methyl‐1‐phenylpropan‐1‐one) moieties as backbone substituents are prepared using nitroxide‐mediated radical polymerization (NMP). Such polymers can be readily activated via the Norrish‐type I photoreaction to give polymeric acyl radicals. Photolysis in the presence of a persistent nitroxide, which serves as a C‐ radical trapping reagent, leads to chemically modified polymers conjugated with nitroxide moieties. The number‐average molecular weight ( M n ) of the prepolymers and the chemically modified polymers was determined by gel permeation chromatography (GPC). Structures were further confirmed by NMR spectroscopy and by attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy.