Spider silk protein films and a method of manufacturing the same

A film comprising a polypeptide derived from spider silk proteins, there is the decomposition temperature of 240 to 260 ° C., ultraviolet light of the light wavelength 200~300nm absorb, light transmittance of 85% or more in the optical wavelength 400~780nm has a colorless and transparent in the visible light region. Production method of the present invention can be prepared by dissolving the polypeptides derived from spider silk proteins in dimethyl sulfoxide solvent, the dope solution and casting the dope solution onto the substrate surface. Thus, easy to form a film, also provides a good spider silk protein films and a method for producing the same stretchability.