| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Mussel Inspired Construction and Properties of Polylactic Acid Multilayer Composite Film |
| MAO Long1,2, XIE Jianda1, LEI Yongzhen2, FAN Shuhong2, LIU Yuejun1,2
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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 |
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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.
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Published: 07 September 2021
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| Fund:National Natural Science Foundation of China (11872179), Natural Science Foundation of Hunan Province, China (2019JJ50132), Science and Technology Planning Project of Fujian Province, China (2018H6024), High-Level Talents Support Plan of Xiamen University of Technology, China (YKJ19008R), Open Fund for Innovation Platform of University in Hunan Province, China (18K079), Young and Middle-Aged Teachers Education Scientific Research Project of Fujian Province (JAT200475). |
About author:: Long Maoreceived his Ph. D. degree in materials scien-ce and engineering from Hunan University of Techno-logy in June 2018. He is currently an associate professor in Xiamen University of Technology. He is mainly engaged in the structural design and functionalization of layered clay, and applied it to the preparation of high-performance polymer active packaging materials. In recent years, he has participated in or presided over a number of national, provincial and enterprise research projects, published 23 journal papers, including 12 papers published in SCI journals, 7 papers published in EI journals, and applied for more than 20 national invention patents, including 11 authorized patents.
Yuejun Liuobtained his Ph. D. degree in material processing engineering from South China University of Technology in 2002. He performed collaborative research in 2012—2013 in University of Wisconsin (Madison). He is currently a professor and doctoral supervisor enjoying the special allowance from the State Council. He is mainly engaged in polymer materials processing engineering, new packaging materials and technology of teaching and scientific research. He has presided over 4 general projects of National Natural Science Foundation of China, presided over more than 10 provincial and ministerial projects, published more than 50 SCI and EI papers, and authorized more than 20 national invention patents. He has won the first prize of Science and Technology Progress of Hunan Province, the first prize of Educational Achievement of Hunan Province, the first prize of Industry University Research Innovation Achievement of China, and the first prize of Science and Technology Progress of Xiamen. He has trained 10 doctoral students and 45 master students. And many students have won the provincial excellent dissertation, provincial excellent graduate students, provincial science and technology awards. |
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2021, Vol. 35 
