6,6′-Disulfide Cross-Links in Cotton Cellulose; Part II: Effects of Different Cross-Linking Conditions1

The effects of covalent, intermolecular cross-linking resulting from the introduction into cellulose of thio (SH) groups which are subsequently oxidized to form disulfide (S—S) linkages between the cellulose chains are discussed. When the reactions described herein are carried out on cotton fabrics, there is enhanced wet and/or dry wrinkle recovery, depending upon the mode of thio group oxidation. The results of oxidation in aqueous, nonaqueous, and gas-phase systems are compared. The relation between the degree of cross-linking and wrinkle recovery is described in quantitative terms. The effects of intermediate reactions and disulfide cross-linking on strength as well as on wrinkle recovery are also described.