Abstract
1. It was proved that degree of swelling of silk was closely related to ζ-potential of silk. The interfacial electrochemical properties of silk were studied with streaming potential method.
2. The negative charge of heat treated silk increased in accordance with the rising of the heat treated temperature to 150°C. But it decreased on the heat treated temperature, 175°C and 200°C. It is satisfactory to consider decrease of ζ-potential on the treated temperature above 175°C as increase of adsorption interfaces by loose of micell and decrease of surface charge density.
