Abstract:

A kind of ApSF-PLA composite film was prepared by adding Antheraea pernyi silk fibroin (ApSF) to polylactic acid (PLA) matrix through solution blending method. The effect of ApSF on the properties of PLA plastics was investigated. The results showed that the characteristics of ApSF-PLA composite film were affected by phosphoric acid hydrolysis time of ApSF, ApSF-water ratio, drying temperature, and plasticizer PEG-400 addition amount. The optimal preparation conditions were phosphoric acid hydrolysis time for ApSF of 3 h, ApSF-water ratio of 2%. Under the optimal conditions, the ApSF-PLA composite film exhibited better comprehensive properties with tensile strength of 19.75－23.89 MPa, and tensile strain of 37.42%－48.20%. The film also revealed better waterproof and anti-oil performance. Moreover, the ApSF-PLA film exhibited the best UV-shielding effect in UV-B range when ApSF-water ratio of 45 and phosphoric acid hydrolysis time of 1 h. UV transmittance of the prepared composite film at the optimal conditions was 9.4%－12.7%. An excellent composite effect of the ApSF-PLA film was achieved through IR analysis.

Key words: polylactic acid, Antheraea pernyi silk fibroin, composite film