Normal alkanes and polyethylene were crystallized from a melt state in a temperature gradient. The feature of the crystallization depends both on the crystallizing speed and on the tube diameter of the specimen. Crystalline orientations of the grown specimens, investigated by X-ray diffraction method, are possible to classify into two orientations: One is that the c*-axis is perpendicular to the growth direction, and the other parallel to it.
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Asano, T. Melt-crystallization of n-alkanes and polyethylene in a temperature gradient. Polymer Bulletin 10, 547–552 (1983). https://doi.org/10.1007/BF00285374
- Temperature Gradient