Preparation of silk powder and the properties of the molded materials.

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Abstract
Silk powders were prepared by freeze-drying of a silk fibroin solution, which was obtained by dialysis of an aqueous calcium chloride solution of silk fibroin. Silk powders were treated with formaldehyde or with water-solution urethane resin, and their properties were studied. The DTA results showed that the thermal stability of silk powders increased by the treatment with formaldehyde and urethane. The chemically modified silk powders were molded at 150°C under pressure. The molded silk powder had better water absorbing property than those of other resins. The wet strength of the molded formaldehyde-treated silk powders did not decline while a declining tendency was observed for the molded untreated silk powders.

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