利用分级结构层状黏土构建高阻隔性脂肪族聚酯复合材料  

Construction of High Barrier Aliphatic Polyester Composites Based on Hierarchical Layered Clays

作　　者：姚进[1] 毛龙[1,2] 刘小超[1] 李知函[1] YAO Jin;MAO Long;LIU Xiaochao;LI Zhihan(Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province,Hunan University of Technology,Zhuzhou 412007;Fujian Provincial Key Laboratory of Functional Materials and Applications,Xiamen University of Technology,Xiamen 361024)

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

出　　处：《材料导报》2019年第S02期617-622,642,共7页Materials Reports

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)~~

摘　　要：以MgAl-CO3 LDHs(P-LDHs)为原料,通过煅烧-水化法制备出较大比表面积的分级结构水滑石(H-LDHs),研究了不同的水化条件对H-LDHs微观形貌的影响;然后采用溶液浇筑法将H-LDHs与聚己内酯(PCL)共混制备出H-LDHs/PCL复合材料,研究了H-LDHs对H-LDHs/PCL复合材料结构和性能的影响。结果表明,在H-LDHs的表面出现了大量垂直排列的纳米片层,形成了多层次分级结构;H-LDHs的比表面积(146.6 m^2/g)达到了P-LDHs的3.67倍。氧气程序升温脱附结果表明,H-LDHs与氧气之间存在较强的化学吸附。H-LDHs改善了P-LDHs对PCL基材力学性能的恶化,这是由于H-LDHs表面垂直分布的大量纳米片层与PCL基材紧密结合,增加了H-LDHs与PCL基材的界面作用面积。相比于纯PCL,H-LDHs/PCL复合材料的氧气渗透性降低了43.6%,通过这种分级结构的层状黏土来延长平行于气体渗透方向的路径,从而较大幅度提高气体的阻隔性能,具有较好的研究价值和应用潜力。In this paper,MgAl-CO3 LDHs(P-LDHs)were used as precursor to prepare hierarchical LDHs(H-LDHs)with large specific surface area by calcination-rehydration method.The effect of different rehydration conditions on the micro-morphology of H-LDHs was studied.And H-LDHs/PCL composites were prepared by mixing H-LDHs with poly(ε-caprolactone)(PCL)by solution casting method.The effect of H-LDHs on the structure and properties of H-LDHs/PCL composites was also studied.The results showed that a large number of vertically aligned nano-sheets were formed on the surface of H-LDHs,forming a multi-level hierarchical structure.The specific surface area of H-LDHs(146.6 m^2/g)was 3.67 times of that of P-LDHs.The results of oxygen temperature programmed desorption showed that there is strong chemisorption between H-LDHs and oxygen molecules.And H-LDHs improved the deterioration of mechanical properties of P-LDHs on PCL matrix.A large number of nano-layers vertically distributed on the surface of H-LDHs were closely combined with PCL matrix,and the interface area between H-LDHs and PCL matrix was increased.Compared with pure PCL,the oxygen permeability of H-LDHs/PCL composites decreased by 43.6%.The layered clay with this hierarchical structure can prolong the path parallel to the direction of gas permeation significantly,thus greatly improving the gas barrier properties.H-LDHs/PCL composites show good research value and application potential.

关 键 词：层状双羟基金属氧化物 分级结构 复合材料 阻隔性能 渗透路径 

分 类 号：TB332[一般工业技术—材料科学与工程]