Effect of Peroxidase-Hydrogen Peroxide Bleaching System on Tensile Properties of Nylon Yarns.

Orange II in the presence of nylon yarns was bleached with a mixture of horseradish peroxidase (HRP) and hydrogen peroxide (H2O2), or percarbonate. After the bleaching, the tensile properties of the nylon yarns were measured in terms of tensile strength and breaking elongation. In addition, the fracture surface of nylon yarns bleached with two bleaching systems was observed by an electron microscope. The HRP-H2O2 bleaching system gave no changes of tensile property and morphology of nylon yarns, compared with those properties of unbleached nylon yarns. In the case of percarbonate bleaching system, tensile strength and breaking elongation of the nylon yarns were markedly decreased at 70°C, and it was presumed the nylon yarns became inelastic as a result of the form observation.