摘要
为了提高聚乳酸(PLA)薄膜的抗菌性、紫外光屏蔽等活性包装功能,本工作受到贻贝仿生学原理启发,利用多巴胺(DA)在PLA薄膜表面发生氧化自聚形成聚多巴胺(PDA)涂层(PLA-P),再利用PDA的儿茶酚基团将Ag+还原成Ag纳米粒子(AgNPs)负载在PDA上(PLA-PA),进一步接枝上氟硅烷(PLA-PAF),从而成功制备出PLA多层复合薄膜,并研究了不同涂层对PLA多层复合薄膜结构和性能的影响。结果表明,PLA多层复合薄膜的表面涂层结构致密,AgNPs均匀负载在PLA上,尺寸约为65 nm,表面质量分数达到38%;相比纯PLA薄膜,PLA-PAF的拉伸强度(99.1 MPa)和断裂伸长率(16.1%)仅分别降低了5.9%和7.5%,热稳定性略微提高,水接触角达到117.8°,疏水性得到显著提高;PLA基材经过原位还原负载AgNPs和接枝氟硅烷之后,PLA-PAF的抗菌率达到了99.5%,紫外光屏蔽性显著提高,而且由于其较好的疏水性,在实际使用时能够减少细菌的黏附和滋生,进一步提升抗菌活性。相比完全采用成本较高的AgNPs单一抗菌改性,基于贻贝仿生改性的抗菌涂层将在PLA活性包装领域具有较好的研究意义。
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.
作者
毛龙
谢建达
雷永振
范淑红
刘跃军
MAO Long;XIE Jianda;LEI Yongzhen;FAN Shuhong;LIU Yuejun(Fujian Provincial Key Laboratory of Functional Materials and Applications,Xiamen University of Technology,Xiamen 361024,China;Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province,Hunan University of Technology,Zhuzhou 412007,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第16期16178-16183,共6页
Materials Reports
基金
国家自然科学基金(11872179)
湖南省自然科学基金(2019JJ50132)
福建省科技计划项目(2018H6024)
厦门理工学院高层次人才科研启动项目(YKJ19008R)
湖南省高校创新平台开放基金(18K079)
福建省中青年教师教育科研项目(科技类)(JAT200475)。
关键词
贻贝仿生
聚乳酸
银
抗菌
涂层
mussel bionics
polylactic acid
silver
antibacterial
coating
