Abstract
Excimer laser irradiation was applied to aramid fibers (PPODPTA fiber, PPTA fiber), A micro-structure of unevenness was formed, perpendicular to the fiber axis, and this structure became larger with the laser wavelength. Even in undrawn fiber, a slight structure of unevenness was formed perpendicular to the fiber axis, just as in drawn fiber. This was thought to be due to the high orientation of undrawn aramid fiber. It was found by XPS analysis that the atomic ratio of O/C in the PPODPTA fiber declines and the ratio of oxygen present is lower. For PPTA fiber, however, this ratio showed almost no change and stayed at a set value. It is considered that the difference in the above results is caused by the difference in chemical structures between PPODPTA fiber and PPTA fiber (difference in the bond energy of the ether and amide bond).
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