Abstract
The orientation behavior of crystalline phases in the process of uniaxial stretching of tubular extruded polyethylene film with a hot-air type industrial stretcher is described quantitatively in terms of the degree of biaxial orientation and X-ray pole figure. In the initial stretching stage, the a-axes are separated rather definitely into those oriented parallel to the Z-axis and those oriented perpendicular to the Z-axis. The degree of ‾cos2Φz of a-axes and c-axes is same for both axes. The changes of ‾cos2Φb,i which have taken place in the interval are negligible. From these phenomena it seems fairly justifiable to conclude that the greatest factor of the orientation mechanism in the initial stage is simple (100) [001] plastic slipping and rotation of the slip on a (100) plane around the b-axis. This structure, as the limiting case in the initial stretching process, is a combination of two simple structures in terms of crystal: the type I (a-axis model) suggested by Holmes et al., and the fiber type. In terms of orientation functions of three principal crystallographic axes, a transformation from the Kobayashi’s model or the type I model to the Fiber type model follows the rule of the type II model suggested by Keller.
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Takahashi, T., Sato, I. Orientation Behavior of Polyethylene Crystals. Polym J 1, 296–303 (1970). https://doi.org/10.1295/polymj.1.296
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DOI: https://doi.org/10.1295/polymj.1.296