Confined‐growth crystallization of polyethylene

A new typical orientation pattern of polyethylene has been observed in extruded, melt‐drawn composites containing 10% polyethylene and 90% polystyrene. In these composites, the polyethylene phase is dispersed in the polystyrene matrix as thin, long ribbons (width 1000 Å, thickness 500 Å). The b axis...

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Published in:Journal of polymer science. Part A-2, Polymer physics Polymer physics, 1972-03, Vol.10 (3), p.507-517
Main Authors: Mencik, Z., Plummer, H. K., Van Oene, H.
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Language:English
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description A new typical orientation pattern of polyethylene has been observed in extruded, melt‐drawn composites containing 10% polyethylene and 90% polystyrene. In these composites, the polyethylene phase is dispersed in the polystyrene matrix as thin, long ribbons (width 1000 Å, thickness 500 Å). The b axis of the crystallites is found oriented preferentially along the long dimension of the ribbons, i.e., in the extrusion direction. The a and c axes of the crystallites show no preferred orientation. This texture pattern is attributed to the fact that, in view of the small cross section of the polyethylene phase, crystallization can proceed only along the long axis of the ribbons. Since the b axis is the direction of fastest growth in polyethylene (and the radial direction in a spherulite), most polyethylene unit cells are oriented with their b axes in the long dimension of the ribbons.
doi_str_mv 10.1002/pol.1972.160100307
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title Confined‐growth crystallization of polyethylene
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