Mussel Inspired Construction and Properties of Polylactic Acid Multilayer Composite Film
MAO Long1,2, XIE Jianda1, LEI Yongzhen2, FAN Shuhong2, LIU Yuejun1,2
1 Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, China; 2 Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, Hunan University of Technology, Zhuzhou 412007, China
Abstract: The work aims to improve antibacterial, UV shielding and other active packaging functions of polylactic acid (PLA) film. Inspired by the bio-nics of mussels, PLA coated with polydopamine (PDA) (PLA-P) was formed by the oxidation and self-polymerization of dopamine (DA) on the surface of PLA film. And then Ag+ was reduced to Ag nanoparticles (AgNPs) by catechol group of PDA, which were loaded on the surface of PLA-P film (PLA-PA). Fluorosilane was further grafted onto the surface of PLA-PA film (PLA-PAF). By above methods, PLA multilayer compo-site film was successfully prepared. The effects of different coatings on the structure and properties of PLA multilayer composite films were investigated. The results indicate that the surface coating structure of all the PLA multilayer composite film is compact. AgNPs were uniformly loaded on the surface of PLA-PA multilayer composite film, and their particle size and mass fraction were 65 nm and 38%, respectively. Compared with pure PLA film, the tensile strength (99.1 MPa) and elongation at break (16.1%) of PLA-PAF multilayer composite film were only reduced by 5.9% and 7.5%, respectively. The thermal stability was slightly improved, and the water contact angle reached 117.8°. After in-situ reduction of AgNPs and grafting of fluorosilane on PLA-P multilayer composite film, the antibacterial rate of PLA-PAF multilayer composite film reached 99.5%. And the UV shielding property of the above film is improved significantly. Because of its good hydrophobicity, it can reduce the adhesion and growth of bacteria in practical use, and further improve the antibacterial activity. Compared with the single antibacterial modification of AgNPs with high cost, mussel inspire antibacterial coating will have better research significance in the field of PLA active packaging.
毛龙, 谢建达, 雷永振, 范淑红, 刘跃军. 贻贝仿生构建聚乳酸多层复合薄膜及其性能[J]. 材料导报, 2021, 35(16): 16178-16183.
MAO Long, XIE Jianda, LEI Yongzhen, FAN Shuhong, LIU Yuejun. Mussel Inspired Construction and Properties of Polylactic Acid Multilayer Composite Film. Materials Reports, 2021, 35(16): 16178-16183.
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2021, Vol. 35 
