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Nature | Vol.174, Issue.4437 | | Pages 926-927
Perpendicular Orientations in Polyethylene
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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Perpendicular Orientations in Polyethylene
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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