Abstract
PERPENDICULAR orientation (chain-molecules perpendicular to an axis of rotation) has been frequently reported in studies on polyethylene. I have shown1 that very similar X-ray patterns can be given by two entirely different perpendicular structures: (i) where the a-axis is parallel to the fibre-axis and consequently b and c are perpendicular to it; (ii) where the b-axis is an axis of cylindrical symmetry, and the b-axes themselves are randomly arranged in planes perpendicular to the direction of draw, which itself is perpendicular to the X-ray beam.
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References
Keller, A., J. Polymer Sci. (in the press).
Holmes, D. R., Miller, R. G., Palmer, R. P., and Bunn, C. W., Nature, 171, 1104 (1953).
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KELLER, A. Perpendicular Orientations in Polyethylene. Nature 174, 926–927 (1954). https://doi.org/10.1038/174926a0
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DOI: https://doi.org/10.1038/174926a0
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