UV–Vis Monitoring of Radical Polymerizations
by Spin Trapping with Chromophoric Nitrones
Posted on 2014-02-11 - 00:00
The application of chromophoric radical
spin traps for highly sensitive
UV–vis monitoring of conversion of radical enhanced spin capturing
polymerizations (ESCP) is presented. In ESCP the growing macroradical
is reacting with a nitrone providing the corresponding polymeric nitroxide
radical spin trap which will react irreversibly with a second macroradical
to eventually give a polymeric alkoxyamine. The progress of styrene
and n-butyl acrylate ESC polymerizations in the presence
of π-conjugated nitrones is successfully visualized via a significant
change of absorbance of the nitrone chromophore in the 200–500
nm range due to the nitrone transformation into an alkoxyamine moiety
upon incorporation into the polymer. Moreover, related studies on
UV–vis monitoring of photochemical rearrangement of nitrones
to their corresponding oxaziridines are discussed.
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Husmann, Ralph; Wertz, Sebastian; Daniliuc, Constantin
G.; Schäfer, Sascha W.; McArdle, Ciarán B.; Studer, Armido (2016). UV–Vis Monitoring of Radical Polymerizations
by Spin Trapping with Chromophoric Nitrones. ACS Publications. Collection. https://doi.org/10.1021/ma4025174
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AUTHORS (6)
RH
Ralph Husmann
SW
Sebastian Wertz
CD
Constantin
G. Daniliuc
SS
Sascha W. Schäfer
CM
Ciarán B. McArdle
AS
Armido Studer