Investigation on Functional Properties of 1,2,3,4-Butanetetracarboxylic Acid Cross-Linked Fabrics Impacted by Molecular Structures and Chemical Affinity of Catalysts
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文摘
1,2,3,4-Butanetetracarboxylic acid (BTCA), catalyzed by sodium hypophosphite (SHP), brings good antiwrinkle property to cotton fabrics and causes significant strength losses due to cross-linking and acidic degradation of cellulose simultaneously. Previous studies presented optimum pH values for different catalysts based on wrinkle recovery angle but without analyzing the tensile strength losses (TSL) of the treated fabrics. Here, the differences in TSL were analyzed from catalyst diffusibility and affinity to BTCA and cellulose based on anion sizes and Hansen solubility parameters of the corresponding acids of catalysts, respectively. Results showed that smaller catalyst anions such as the SHP anion would diffuse into the fibers more deeply, causing more TSL due to more cross-linking (TSLC). Besides, the lower affinity of the catalyst to BTCA and cellulose would accelerate the cross-linking reaction, also resulting in more TSLC. Connolly accessible area of an acid anion, catalyst anion concentration, and temperature also affected TSL.