Some fragrant fibres and yarns based on chitosan

Novel fragrant chitosan derivatives, fibres and yarns were prepared. The degree of substitution (d.s.) for Schiff's base was at 0.25-1.00 in the solution state and at 0.19-0.89 in the fibre state. The fragrant chitosan fibres had 4.50-5.16 denier for the titer, 0.40-1.05 gf/denier for the tenacity and 3.9-14.5% for the elongation. A bundle of two silk fibroin filaments was coated with a layer of chitosan, and the chitosan layer was N-modified with the fragrant aldehydes to give rise to fragrant yarns. The yarns had 24.0-33.2 denier for the titer, 2.02-2.75 gf/denier for the tenacity and 9.6-16.9% for the elongation. A portion of the fragrant aldehydes was slowly released from the fragrant chitosan derivatives, fibres and yarns in the open air at room temperature, but little released in a closed dry glass vessel. (C) 2003 Elsevier Ltd. All rights reserved.