抄録
In the previous paper, it has been reported that heat conduction in a paper cylinder during high temperature steaming with humid air was considerably affected by the presence of urea. In the present paper, the effect of urea on the fine structure of nylon 6 fiber treated by high temperature steaming with humid air was investigated under various conditions of absolute humidity.
Furthermore, nylon 6 fiber and filament were treated with various compositions of urea/water solution heated to 140°C in order to investigate in some detail the effect of urea during the steaming. Change of fine structure was observed by X-ray diffraction patterns. Further, crystallite size, lattice spacing and crystallinity were measured by means of X-ray diffractometer and density gradient tube.
The following results were obtained:
(1) Shrinkage of nylon 6 filament treated by the steaming increased with an increase of absolute humidity, particularly in the presence of urea. Crystal_??_size also increased.
(2) Shrinkage, crystallinity and water absorption of nylon 6 fiber treated with hot solution of various compositions of urea/water increased with an increase of water content in treating medium.
