Effect of structural and chemical modification of cellulose fiber with nitrogen(IV) oxide on mechanical properties

The effect of treatment with nitrogen(IV) oxide solutions in CCl 4 at various concentrations on a change in the amount of carboxylic groups and the structure, mechanical properties, and stability of cord viscose and cotton threads in a phosphate buffer (pH 7.5) was studied. It was found that the breaking tensile stress and resistance to hydrolysis of oxidized cellulose threads depend on the extent of their oxidation and structural ordering. The viscose cord threads that were oxidized at 289 ± 1 K with a 5% N 2 O 4 solution in CCl 4 and contained up to 1.5% COOH groups show a satisfactory mechanical strength and stability to hydrolysis in the phosphate buffer.