Abstract
Difference of the mechanical properties between calender films and melt spun fibers, produced by using low molecular weight polyethylene, was discussed in terms of morphological aspects. The viscosity-average molecular weights of the calender films and the melt spun fibers were 70,000 and 54,000, respectively. The orientation factor of the c-axis of the film with a maximum draw ratio of 14 was 0.9291, indicating a high orientational degree of the c-axis with respect to the machine direction. This value is slightly higher than that of the drawn fiber (0.8423). In contrast, the Young’s modulus of the drawn film was only 15.3 GPa, while the Young’s modulus of the drawn fiber reached 55.6 GPa. The results were explained by the difference of the morphological properties which were obtained by using small angle X-ray scattering, wide angle X-ray diffraction, small angle light scattering, and birefringence measurements. A conclusion drawn from this work is as follows; the preferential orientation of the c-axes of the films is mainly due to the rotation of crystallites, while that for the fibers is due to the crystal transformation from a folded to a fibrous type.
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Kang, S., Matsuo, M. Deformation Mechanism of Calender Films and Melt Spun Fibers Produced by Low Molecular Weight Polyethylene. Polym J 21, 49–63 (1989). https://doi.org/10.1295/polymj.21.49
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DOI: https://doi.org/10.1295/polymj.21.49