Effect of chitosan on dyeing of chemical fibres

Abstract

Treatment with chitosan before dyeing significantly improves the properties of fabrics made of polyester and polyamide fibres: it increases the intensity and fastness of the colors of the fabrics; the capillary and sorption properties of the fabrics are improved due to swelling of the chitosan film on the fibre; the mechanism of dyeing textile materials is significantly altered by not requiring penetration of the dye into the depth of the fabric.

Functional finishing of aminated polyester using biopolymer‐based polyelectrolyte microgels

“…In the case of PET A, it is attributed to the amide bonds formed between primary amine groups of ethylenediamine and ester groups of poly(ethylene terephthalate); in the case of PET ACM, the band appears even stronger owing to the multiple amide groups of the CM complexes contributing to the absorption. Additionally, a weak broad band that appears in the 3100–3400 cm –1 region of the PET ACM spectrum is attributed to N–H stretching of amine groups and O–H stretching of hydroxyl groups [30–33]. This wavelength range, 3000–3500 cm –1 , is the basic region of interest for chitosan‐treated polyester [33] because it is characteristic of vibrations of the chitosan hydroxyl groups involved in hydrogen‐bond formation.…”

“…Additionally, a weak broad band that appears in the 3100–3400 cm –1 region of the PET ACM spectrum is attributed to N–H stretching of amine groups and O–H stretching of hydroxyl groups [30–33]. This wavelength range, 3000–3500 cm –1 , is the basic region of interest for chitosan‐treated polyester [33] because it is characteristic of vibrations of the chitosan hydroxyl groups involved in hydrogen‐bond formation. Combined with the bands at 2867 and 2908 cm –1 , which also appear in the PET ACM spectrum and are assigned to C–H stretching of chitosan, these data support the suggestion from previous measurements that CM complexes are present on polyester fibers.…”

Advanced microgel-functionalized polyester textiles adaptive to ambient conditions

“…The small dry microgel add-on of the samples also accounts for that. As reported in literature, the spectral differences among chitosantreated and untreated polyesters are quite small, even when polymer blends and films are investigated (Manyukova et al 2009;Wu 2011), where the amount of chitosan is much higher than that on the functionalized polyesters investigated here. However, by increasing the dry add-on of microgel CM to 5%, it was possible to detect few but important spectral differences between reference polyester PET R 1 and PET RCM 1.…”

“…As seen in Figure 2.9, PET RCM 1 exhibits a broad band centered at 3300 cm -1 which is attributed to hydroxyl and primary amine groups, as discussed previously for Figure 2.8. It is reported in Manyukova et al 2009 that the basic spectral region of interest for chitosan-treated polyester is 3000-3500 cm -1 , as it is characteristic of vibrations of hydroxyl groups involved in hydrogen bond formation; the broad bands in that spectral region allow differentiation between treated and untreated samples. Additionally, it is shown in Figure 2.9 that a strong double band appears at 2340 and 2360 cm -1 for PET RCM 1.…”