摘要
Many investigations on the structure of silk fibroin in aqueous solutions or in films cast from the solutions have been made. The understandings about the structure of silk fibroin in silk gland, however, are still lacking. In the spinning process of silkworm, the silk fibroin stored in the middle silk gland is extruded by stress, undergoing a conformation transition, then accompanied by a process of coagulation and crystallization. Its molecular weight is as large as 3×10~5, but its viscosity is far lower than that of synthetic polymers with com-
基金
Project supported by the National Natural Science Foundation of China
