Abstract
Cotton and regenerated cellulose fiber lyocell were treated with liquid ammonia (NH3), and subsequently processed with dry heat, high temperature (HT) steam at atmospheric pressure and high pressure (HP) steam at 0.22 MPa and hot water at various temperatures. The effects of the processing on crystal modification, crystallinity, moisture regain, water absorption, and dyeing property was investigated. The diffraction intensity of cellulose IIII crystallite of the cotton fiber decreased with increasing a temperature of the hot water, while cellulose I crystallite increased by the treatment. On the other hand, dry heat treatment was not effective for the modification of cellulose IIII crystallite generated at the NH3 treatment. Change of the crystallite phase by the HT and HP steamings occurred less than that of the hot water and more than dry heat. Furthermore, an intensity of the cellulose IIIII crystallite of the NH3 treated lyocell took place no change not only with subsequent hot water but also with dry heat processing. Moisture regain, water absorption, and equilibrium dye uptake of the cotton were decreased by subsequent hot water processing, whereas thoseof the lyocell were almost unchanged.
