1542213-01-3Relevant academic research and scientific papers
UV-vis monitoring of radical polymerizations by spin trapping with chromophoric nitrones
Husmann, Ralph,Wertz, Sebastian,Daniliuc, Constantin G.,Schaefer, Sascha W.,McArdle, Ciaran B.,Studer, Armido
, p. 993 - 1000 (2014)
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.
