抄録
Relationship between mechanical properties and fiber structure of the high modulus and the high tenacity fibers prepared by continuous zone-drawing and continuous roll-drawing methods were studied. In the zone-drawn fibers, birefringence of amorphous phase frequently exceeded that of crystalline phase. On the other hand, amorphous birefringence was always lower than that of crystalline phase for the fibers prepared by the continuous roll-drawing method. The crystalline block size and the degree of crystallinity for the continuous roll-drawn fibers were larger than those for the zone-drawn fibers. These results could be interpreted by that drawing stress in the zone-drawing is much larger than that in the roll-drawing, so that linkages of crystalline block are well developed and this leads to the high degree of amorphous orientation and the high modulus. Such linkages will be developed as an increase in crystallinity, when the crystallinity exceeds 77%. On the other hand, the tenacity was mainly dependent on the degree of crystallinity and showed almost the same value between the zone-drawn and the roll-drawn fibers.
