Abstract
A detailed ESR study of free radicals trapped in irradiated urea-poly(ethylene oxide) complex was carried out. On annealing at room temperature, the triplet spectrum observed immediately after γ-irradjation at 77 K was converted to a quartet spectrum. Using the spectrum simulation method, the quartet spectrum was found to derive from the scission free radicals, , in which the methylene group took on a trans-gauche type configuration. Temperature dependences of hyperfine splitting widths due to β- and γ-protons were observed and analyzed in terms of the hindered oscillation of the β-methylene group and rotation around the Cα–O bond axis.
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Shimada, S., Fujiwara, A. & Kashiwabara, H. Mobility and ESR Spectra of Free Radicals Trapped in Irradiated Urea–Poly(ethylene oxide) Complex. Polym J 13, 769–775 (1981). https://doi.org/10.1295/polymj.13.769
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DOI: https://doi.org/10.1295/polymj.13.769