Structure of decrystallized cotton in fabrics prepared by alkali and acrylonitrile treatments

Abstract

SynopsisThe crystalline structure of decrystallized cotton, prepared by partial cyanoethylation with the use of sodium hydroxide aqueous solution and acrylonitrile, was examined by x-ray and IR data, in connection with such fabric properties as moisture regain. It was found that the moisture regain of the cotton fabric first increased, passed through a maximum at about 6 mole-% of cyanoethylation, and then slightly decreased with increasing degree of cyanoethylation. The increase of moisture regain in the region of the lower degree of cyanoethylation was well related to the decrease in the crystallinity of cotton. The x-ray diffraction studies revealed that the distension and disorder of the unit cell occurred primarily in the direction perpendicular to the (101) crystal plane as cyanoethylation proceeded.

Solvent‐induced partial cyanoethylation and hydroxylation of cyanoethyl group

“…The infrared ratios obtained from the spectra are presented in Figure 13. It is observed that acrylonitrile treatment have reduced the crystallinity index value as observed by Hirai et al25 In acetone treatment, the infrared ratio decreases steadily up to 6 mL and then increases gradually with an increase in concentration. It was pointed out by Awadel‐Karim et al26 that the crystallinity index increases with increase in acetone concentration during solvent treatment of cotton cellulose.…”

Effect of solvent induced hydroxylation of cyanoethyl group on dye uptake of cotton fabrics

“…Hirai et al 18 showed that the crystallinity could be decreased by the cyanoethylation treatment. These results could be attributed to the larger volume of the cyanoethyl group by virtue of which it is able to bring about more severe distension of molecular bundles.…”

Chemical modification of cotton fiber by alkali‐swelling and substitution reactions—acetylation, cyanoethylation, benzoylation, and oleoylation

“…Heat and acid resistances were improved, but light resistance was almost the same as the untreated cotton (Table VII). The treated cotton fabrics having the degree of cyanoethylation of [11][12][13][14][15][16][17][18][19] mol % showed dye uptake of direct dye higher than mercerized cotton. They also showed dye uptake of cationic dye similar to acrylic fiber (Table VIII).…”