植酸-金属离子螯合物改性层状黏土及其在聚己内酯中的增强与抗菌效应研究  

Phytic acid-metal ion chelate coated layered clay and its enhancement and antibacterial effect in poly(ε-caprolactone)

作　　者：毛龙[1,2] 刘小超[2] 谢斌 吴慧青[1] 刘跃军[1,2] MAO Long;LIU Xiao-chao;XIE Bin;WU Hui-qing;LIU Yue-jun(Fujian Provincial Key Laboratory of Functional Materials and Applications,Xiamen University of Technology,Xiamen 361024,F ujian,China;Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province,Hunan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]厦门理工学院福建省功能材料及应用重点实验室,福建厦门361024 [2]湖南工业大学先进包装材料与技术湖南省重点实验室,湖南株洲412007

出　　处：《材料工程》2021年第2期127-135,共9页Journal of Materials Engineering

基　　金：国家自然科学基金(11872179);福建省科技计划项目(2018H6024);湖南省自然科学基金(2019JJ50132);厦门理工学院高层次人才科研启动项目(YKJ19008R);福建省自然科学基金(2018J0502);福建省教育厅项目(JK2017035)。

摘　　要：基于植酸(PA)优异的螯合能力,利用Ag^+,Cu^2+,Fe^3+和Zn^2+4种金属离子与PA发生螯合作用并沉积吸附在层状双羟基复合金属氧化物(LDHs)表面,形成核-壳结构,以达到改善层状黏土与聚合物基体之间界面相容性的目的。制备出不同金属离子负载的表面包覆改性LDHs(LDHs@PA-M),深入研究LDHs@PA-M在不同金属离子负载下的微观形貌,并将其应用在聚己内酯(PCL)的增强改性中。结果表明,PA能够与Ag^+和Cu^2+在LDHs表面形成稳定、均匀的纳米包覆层。利用金属Ag^+和Cu^2+优异的抗菌活性,LDHs@PA-Ag^+和LDHs@PA-Cu^2+对大肠杆菌(E.coli)的抗菌率均超过99.99%。相比于纯的PCL,LDHs@PA-Cu^2+/PCL纳米复合材料(LDHs@PA-Cu^2+的质量分数为1%)的拉伸强度和断裂伸长率分别提高了30.7%和33.3%,达到了40.9 MPa和816%,力学性能增强效果最为显著。LDHs@PA-Cu^2+/PCL和LDHs@PA-Ag^+/PCL纳米复合材料对E.coli的抗菌率均达到99.99%,表现出优异的抗菌活性,拓展了层状黏土/生物基高分子复合材料在活性包装领域的应用。Based on the excellent chelating ability of phytic acid(PA),Ag+,Cu2+,Fe3+,and Zn2+,were used to chelate with PA,and deposited on the surface of layered double hydroxides(LDHs)to form core-shell structure,so as to improve the interfacial compatibility between layered clay and polymer matrix.Surface coated LDHs(LDHs@PA-M)loaded with different metal ions were prepared.The micromorphology of LDHs@PA-M loaded with different metal ions was studied and applied in the strengthening modification of poly(ε-caprolactone)(PCL).The results show that PA can form stable and uniform nano-coatings with Ag+and Cu^2+on the surface of LDHs.With the excellent antibacterial activity of Ag+and Cu^2+,the antibacterial rates of LDHs@PA-Ag+and LDHs@PA-Cu^2+against Escherichia coli(E.coli)both exceed 99.99%.Compared with pure PCL,the tensile strength and elongation at break of LDHs@PA-Cu^2+/PCL nanocomposites(mass fraction of LDHs@PA-Cu^2+is 1%)increase by 30.7%and 33.3%,reaching 40.9 MPa and 816%,respectively.The enhancement of mechanical properties for LDHs@PA-Cu^2+/PCL nanocomposites is the most remarkable.The antibacterial rate of LDHs@PA-Cu^2+/PCL and LDHs@PA-Ag+/PCL nanocomposites against E.coli both exceed 99.99%.It shows excellent antibacterial activity,which expands the application of layered clay/bio-based polymer nanocomposites in the field of active packaging.

关 键 词：植酸 层状黏土 表面改性 界面相容性 抗菌活性 

分 类 号：TB332[一般工业技术—材料科学与工程]