Abstract
Ruland’s concept of the isotropic disorder function is used to estimate the disorder parameter and degree of crystallinity in γ-ray irradiated and solution-grown poly(oxymethylene)s. The degree of crystallinity increases with increasing irradiation dosage, but the disorder parameter remains constant. The disorder is attributed to thermal motions, the root mean squared amplitude being about 0.2 Å at room temperature. The increase in crystallinity is mainly caused by degraded molecular chains in the disordered region. The disorder parameter of the solution-grown crystal is larger than that of γ-ray irradiated samples and decreases with annealing. Increase in the disorder parameter in the solution-grown crystal may be caused by the lattice imperfections in the crystal. In both samples the degree of crystallinity decreases above 70°C, and at 120°C it is 5% less than the value at room temperature. In this temperature range, partial melting at the surface layer of the crystal may take place.
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Aoki, Y., Chiba, A. & Kaneko, M. X-Ray Determination of the Disorder in Poly(oxymethylene) Crystals. Polym J 2, 22–28 (1971). https://doi.org/10.1295/polymj.2.22
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DOI: https://doi.org/10.1295/polymj.2.22