Abstract
The single fibers of silk fibroin were treated with various transition bivalent metal ammine complexes in solution under various conditions, i. e. pH and ion concentration in the bath, treating temperature, species of anion and metal ion, such as copper (II), nickel (II), zinc(II) and silver (I). Adsorbed amounts of metal ion for fibroin fiber were determined by atomic absorption analysis. For the structural analysis, the following methods were used: X-ray diffraction infrared spectra, optical microscopy, load-extention, thermal gravimetric analysis (TGA) and difierential thermal analysis (DTA). The results are as follows;(1) Adsorbed amounts of metal ion for silk fibroin single fiber treated with metal ammine complexes in aqueous solution were larger in comparison with those treated with metal nitrate at lower pH. (2) X-ray diffraction studies showed that the decrystallization of silkfibroin occurs during the treatment. (3) Tensile strength and elongation of the fibroin decreases after the treatment. (4) Silk fibers treated with metal amine complexes were more stable thermally than those untreated. The heat stabilities of silk fibroin treated with various transition bivalent metal amine complexes aqueous solution change depending on the kinds of metal ion, and the effect is ordered as follows: Ag (I)>Cu (II)>Ni (II)>Zn (II).
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