Ultra‐high‐molecular‐weight polyethylene (UHMW‐PE) can be drawn in the melt in a limited temperature range between the melting point of lamellar crystals, appr. 135°C, and the orthorhombic → hexagonal phase transition temperature, at appr. 155°C. In this particular temperature range, referred to as region 2, drawing results in the formation of a composite structure composed of fibrous crystals as a result of strain‐induced crystallization of the high molecular weight fraction, embedded in a melt of lower molecular weight material. After cooling to room temperature, this latter fraction crystallizes using the fibrous crystals as crystallization nuclei. The resulting structure exhibits a shish‐kebab morphology. Solution‐crystallized as well as melt‐crystallized UHMW‐PE samples were studied with respect to draw efficiency and structure formation during deformation in the melt.
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Aerle et al. (1988) studied this question.
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