Abstract
The anisotropy of NMR spectrum for poly(oxymethylene) obtained by γ-ray induced solid-state polymerization of tetraoxane was investigated as a function of the alignment angle of needle-like crystals with respect to a static magnetic field. On the basis of second moment calculations with the Gaussian-type distribution of oscillation amplitude assumed, the narrowing of the spectrum was attributed more to the rather complicated oscillations (the longitudinal oscillation along the helix axis in addition to the rotational oscillation around the helix axis of amplitude 9° at 20°C) than to the simple rotational oscillation around the helix axis. These complicated oscillations in poly(oxymethylene) crystal occur even at low temperatures and the amplitude of oscillation increases with increasing temperature. These results are in close agreement with those of the X-ray study of the atomic fluctuations by Chiba et al.
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Shibata, T., Iwayanagi, S. NMR Studies on Poly(oxymethylene) Crystals. II.. Polym J 10, 599–605 (1978). https://doi.org/10.1295/polymj.10.599
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DOI: https://doi.org/10.1295/polymj.10.599