Non-phosphorus catalysts for the ester cross-linking of cellulose with 1,2,3,4-butanetetracarboxylic acid
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We studied eight carboxylates as potential catalysts for the cellulose cross-linking with 1,2,3,4-butanetetracarboxylic acid (BTCA) and compared them with sodium hypophosphite (SHP). The results showed that the fabrics treated with sodium formate (SF) exhibited the highest wrinkle recovery angle (WRA) among the selected carboxylates, nearly equivalent to the WRA of the fabrics treated with SHP. We compared the radii and relative concentration ratios of different carboxylates anions, and found that SF had a particular amount of anions in the optimum pH range of the BTCA finishing bath, and had the smallest anion radius, both of which accounted for the higher WRA. The SF anions were present throughout the curing process. Based on the thermogravimetric analysis curves of SF and SHP, SF significantly decreased the temperature of the anhydride formation. In addition, the FTIR spectra displayed a stronger ester absorbance of the fabrics treated with BTCA/SF than those treated only with BTCA, which confirmed that SF accelerated the esterification between BTCA and cellulose.
KeywordsNon-phosphorus Catalysts Textiles Applications Anti-wrinkle
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