Polycarboxylic acids as crosslinking agents for grafting cyclodextrins onto cotton and wool fabrics: Study of the process parameters

Abstract

ABSTRACT:In this paper we describe a new method for the grafting of cyclodextrins (CDs)onto cotton or wool fabrics. The novelty principally concerns the chemical approach of the grafting reaction that was carried out in the presence of polycarboxylic acids, such as 1,2,3,4-butanetetracarboxylic acid, citric acid, or polyacrylic acid. All types of native or CD derivatives could be used successfully as long as they carried enough remaining hydroxyl groups. For example, the amount of native ␤-CD fixed onto the fabrics increased up to 12% in weight, whereas this value decreased to only 3% for the randomly methylated derivative of ␤-CD (RAMEB). We observed that phosphorous salts, such as sodium mono-and dihydrogen phosphate or sodium dihydrogen hypophosphite, catalyzed the reaction. On the other hand, the conventional and convenient pad-dry-cure technique that is currently used at the industrial scale in textile processing was applied. We report that the polycarboxylic acids play the role of linking agent through an esterification (or amidification) reaction with the OH (or NH 2 ) groups of both CD and cotton (or wool) fibers. In addition, this reaction could lead to the graft of a copolymer formed between CD and the polycarboxylic acid. The reaction yield depends on the concentration and nature of the aforementioned reactants and catalysts and on the curing conditions (time and temperature).

Anti‐ultraviolet and physical properties of woolen fabrics cured with citric acid and TiO2/chitosan

“…[5][6][7][8][9] Polycarboxylic acid (PCA) is a good crosslinking agent for antiwrinkle treatments of cotton fabrics. 10,11 In recent years, NanoTiO 2 has been widely used as a photocatalyst; it triggers oxidation and reduction reactions under ultraviolet light, which achieves not only deodorization but also air-purification and disinfection. 12,13 According to the aforementioned discoveries, other than the traditional and the above-stated chitosan treatments, antishrinkage and antibacterial treatments for woolen fabrics have rarely been researched on the basis of photocatalyst application, with a combination of polycarboxylic acid and chitosan.…”

Application of Cyclodextrins in Textile Dyeing

“…They found out that post-dyeing of the prefinished textile blends results in a significant increase in the UPF (UV-protection factor) values as a direct consequence of a remarkable reduction in UV radiation transmission through the plain weave fabric. Very effective bonding of cyclodextrins on cellulose fibres can be achieved by a highperformance resin finish (Ostertag, 2002) or with non-formaldehyde reagents such as polycarboxylic acids (Voncina & Le Marechal, 2005;Martel et al, 2002b) which can covalently esterify hydroxyl groups of cellulose and cyclodextrins and link both moieties together. The same linking/crosslinking reagents can be used in the treating of different synthetic fibres.…”

Cation exchange finishing of nonwoven polyester with polycarboxylic acids and cyclodextrins

“…[2][3][4][5][6] The purpose of this work was to obtain an efficient cation exchange textile from the grafting reaction of cyclodextrins (CDs) onto nonwoven supports made of polyethyleneterephthalate fibers. At the origin, this reaction was developed to graft CDs onto cotton, wool, 7 and polyester fabrics, 8 by using polycarboxylic acids (PCA) as crosslinking agents. This finishing reaction offered new properties to the textiles, as they present enhanced properties of sorption and controlled delivery of many organic molecules like fragrances 9 or aromatic pollutants, 10 through their inclusion into the grafted CD cavities.…”