Chemical Modification and some Aligned Composites of Chitosan in a Filament State

✍ Scribed by Shigehiro Hirano; Min Zhang; Hideki Yamane; Yoshiharu Kimura; Kojiro Matsukawa; Masuo Nakagawa

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 332 KB
• Volume: 3
• Category: Article
• ISSN: 1616-5187
• DOI: 10.1002/mabi.200350028

✦ Synopsis

Abstract

The mono‐filaments (> 10 m in length) of chitosan and the blends of chitosan‐collagen, chitin‐collagen and chitin‐silk fibroin were wet‐spun. The mono‐filaments were chemically N‐modified with each of n‐fatty acid anhydrides, intra‐molecular carboxylic anhydrides, fragrant aldehydes and transition metal ions. The mono‐filament was aligned on a straight line with the mono‐filament of silk fibroin or poly(ethylene terephthalate) (PET), and a bundle of one to three mono‐filaments was coated with a medium of sericin (Se), chitosan or N‐acylchitosan to give rise to novel silk‐mimic filament composites. The filaments coated with a medium of sericin exhibited 26–27 denier for the titer, 2.46–3.36 gf · denier^−1^ for the tenacity and 11.8–25.0% for the elongation. The apparent density (denier · μm^−1^ in the filament diameter) of the filament composites was about 3–4 times higher than that of the mono‐filaments. Portion of fragrant aldehydes in Schiff's base was slowly hydrolyzed at room temperature by contacting with atmospheric moisture in the open air, and released from the fragrant filaments and composites. The filament composites coated with a chitosan medium were thrombogenic, and those coated with N‐acylchitosans were antithrombogenic.

An illustrated model for a silk‐mimic filament composite, N~0~(N~2~I‐FI).

magnified imageAn illustrated model for a silk‐mimic filament composite, N~0~(N~2~I‐FI).