Abstract
Effect of annealing on the crystal structure of polyethylene single crystals was studied by using X-ray diffraction method. The dimension of a axis, the unit-cell volume, and the disorder factor which represents the mean square displacements of carbon atoms from their average locations were found to increase with increasing annealing temperature up to 105°C, below which no lamellar thickening was observed. On the other hand, their values turned to show a decreasing tendency with increasing annealing temperatures above 105°C, where lamellar thickening by annealing was observed. Increase of the unit-cell volume and the disorder factor can be explained by an increase of population of crystal defects introduced into the crystal by thermal motions of molecular chains largely amplified at sufficiently high temperatures. The abnormal structure generated by the rotation of molecular chains around their axes by about 90° was assumed as one of the crystal defects. A fraction of the abnormal structure was estimated by the method previously developed by us on the X-ray diffraction intensities. In the case of the single crystals annealed at 120°C, this amounted to 2% of the whole crystal.
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Iohara, Ki., Imada, K. & Takayanagi, M. X-Ray Studies on Effect of Annealing on Crystal Structure of Polyethylene Single Crystals. Polym J 4, 239–243 (1973). https://doi.org/10.1295/polymj.4.239
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DOI: https://doi.org/10.1295/polymj.4.239