The blend membranes of regenerated SF (silk fibroin) / polylactic acid (PLLA) with molecular weight 100000 were prepared by using different ratios of SF and polylactic acid

and the effects of polylactic acid on silk fibroin were studied.The structures and properties of these membranes were characterized by a series of tests.Through an electronic mechanical testing system

it was demonstrated that the tensile strength and elongation at break of the blend membrane were improved greatly.When the mass percentage of PLLA reached 5%

tensile strength could reach 27.1 MPa

and elongation at break could reach 4.4%.The hydrophilicity of the blend membrane decreased

and its solubility was reduced evidently

but its water permeability increased.The FTIR measurement indicated that the amount of β-sheet structures of the blend membrane was greater than the pure membrane.