Electron paramagnetic resonance study of the photoinitiated polymerization of methacrylonitrile


Journal Article

Using previously detailed continuous-flow techniques, we have studied by electron paramagnetic resonance, EPR, the photolysis of 2,2′-azobis(2-methylpropionitrile), RN:NR, in solution at ca. 25°. The solvents used were toluene, methacrylonitrile, and toluene-methacrylonitrile mixtures. With toluene as the solvent, we observed only the EPR signal from the R· radical. As the toluene was replaced by an increasing proportion of methacrylonitrile keeping the other reaction conditions constant, the signal from R· fell in intensity and was progressively replaced by one other absorption, this being consistent with addition radicals of structure R-[-CH2-C(CN)CH3-]n-CH 2-Ċ(CN)CH3 with n ≥ 0. Spin and relative concentration measurements of R· and the addition radical component as a function of reaction conditions were made and used in a kinetic analysis of this reaction system.

Full Text

Duke Authors

Cited Authors

  • Smith, P; Stevens, RD; Gilman, LB

Published Date

  • January 1, 1975

Published In

Volume / Issue

  • 79 / 24

Start / End Page

  • 2688 - 2693

International Standard Serial Number (ISSN)

  • 0022-3654

Digital Object Identifier (DOI)

  • 10.1021/j100591a019

Citation Source

  • Scopus