Dyeing of chitin nanofibers with reactive dyes and preparation of their sheets and nanofiber/resin composites

Blue, red and yellow chitin nanofibers were obtained using reactive dyes. Since the chitin nanofibers and the dye are covalently bonded, they are resistant to hot water and detergents. Since the dyed chitin nanofibers can be mixed at an arbitrary ratio, purple, orange, and green nanofibers corresponding to the mixed colors could be obtained. The dyed chitin nanofibers were evaluated by the reflection spectrum and the color space (L*a*b*). From the viewpoint of reaction yield and color properties, the appropriate ratio of the reactive dye to chitin was 5% at the maximum. The morphology of chitin nanofibers was maintained even after the introduction of the reactive dye. A resin combined with dyed chitin nanofibers was prepared. By combining with nanofibers, it may be possible to give color and improve mechanical strength to resin while maintaining the transparency of the resin to some extent. [GRAPHICS] .

Automated summary

The study successfully obtained chitin nanofibers of different colors using reactive dyes, which are resistant to hot water and detergents and can be mixed to produce a variety of colors. Through evaluation using reflection spectrum and color space, the optimal ratio of reactive dye to chitin was determined to be 5%, while maintaining the morphology of the nanofibers.