Free radical polymerization of acrylonitrile: mass spectrometric identification of the nitroxide-trapped oligomers formed in and estimated rate constants for each of the first eight propagation steps

摘要

In this study, careful optimization of the rate of addition of the nitroxide trap 1,1,3,3-tetramethylisoindolin-N-oxyl (TMI0) enabled the trapping and subsequent identification by electrospray ionization mass spectrometry (ESI-MS), of up to 11th generation of C radicals for the reaction of cyanoisopropyl radicals with acrylonitrile. The results allowed to estimate the first eight individual propagation rate constants.