Abstract
AbstractElectron spin resonance spectra of stretched polyoxymethylene irradiated with γ‐rays from a Co60 source were studied. With suitable treatment three kinds of spectra were selectively observed: doublet with irradiation and measurement at room temperature; singlet with irradiation and measurement at about −180°C.; triplet with the irradiation at about −180°C. and the measurement at −102°C. The doublet and the triplet spectra showed anisotropy, while the singlet did not. These observations confirm the assignment of the spectra so far reported with unoriented polyoxymethylene, i.e., CH2O, OĊHO, OĊH2 for the singlet, doublet, and triplet, respectively. The doublet spectrum is treated as related to the anisotropic hyperfine coupling tensor, the anisotropic g value and the chain conformation in crystalline polyoxymethylene. A rather small value, p≈0.45, was obtained for the spin density at the central carbon atom.
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