抄録
The reaction of polyester fiber with the sodium hydroxide solution was studied at 60°C, and 95°C. The weight of fiber decreased following decrease in denier, although only small change in strength per denier was observed. Elongation, Young's modulus and degree of crystallinity of obtained fibers were measured. Contents of hydroxyl and carboxyl end groups of polyester were determined. The number of carboxyl group increased by this reaction and that of hydroxyl group decreased. Moisture regain of the fiber increased from 0.4 to 1.8 per cent, proportional to the number of carboxyl end group on the fiber.
