Abstract
Three-layer structure was observed in the polyethylene strips obtained under definite conditions of extrusion, with the high degree of orientation of the core layer being most remarkable. The wide-and small-angle X-ray investigation of the different layers of the strips and the pole figures analysis were performed. In the outer layers a texture is formed. Crystalline structure formed in the core is characterized by almost regular cylindrical arrangement of a and b axes around the extrusion direction. The c axes direction almost coincides with the extrusion direction. In the core of the extruded strand, lamellae are arranged in parallel stacks. The angle value between the normal to the lamellae surface direction and the extrusion direction is about 30°.
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