液相剪切原位剥离蒙脱土纳米片增强高阻氧聚乳酸  

In-situ Liquid Exfoliation of Montmorillonite Nanosheets in Poly(lactic acid)to Resist Oxygen Permeation

作　　者：徐欢 柯律 唐梦珂 尚涵 徐文轩 张子林 付亚男[1] 韩广东 崔金声 杨皓然 高杰峰 张生辉[1] 何新建[5] XU Huan;KE Lyu;TANG Mengke;SHANG Han;XU Wenxuan;ZHANG Zilin;FU Yanan;HAN Guangdong;CUI Jinsheng;YANG Haoran;GAO Jiefeng;ZHANG Shenghui;HE Xinjian(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;Jining Haoke Technology Co.,Ltd.,Jining 272100,China;Henan Key Laboratory of Surface and Interface Science and Technology,School of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225200,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学材料与物理学院,徐州221116 [2]济宁浩珂科技有限公司,济宁272100 [3]郑州轻工业大学材料与化学工程学院,河南省表界面科学重点实验室,郑州450002 [4]扬州大学化学化工学院,扬州225200 [5]中国矿业大学安全学院,徐州221116

出　　处：《高等学校化学学报》2022年第11期259-267,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:52003292,52174222,51803192);江苏省自然科学基金(批准号:BK20200661);中国博士后科学基金(批准号:2020M681763);江苏省博士后科研资助计划(批准号:2021K578C);中央高校基本科研业务费专项资金(批准号:2021QN1115)资助。

摘　　要：提出了液相剪切剥离蒙脱土(MMT)制备寡层纳米片(MNSs)并将其原位引入PLA基体的方法,可经简单的刮刀涂覆法(Blade coating)制备MNSs质量分数为2%,5%和10%的PLA基纳米复合薄膜.该技术路线赋予了MNSs在PLA基体中充分剥离(片层间距可达3.11 nm)和良好取向排列以及较强的界面相互作用.这些结构特征使得纳米复合薄膜的结晶度和力学性能得到大幅提升,同时显著降低了氧气渗透系数.本文不仅提出了可规模化原位剥离二维纳米片的有效方法,更为制备高强高阻隔全降解复合材料及其结构-性能关系研究提供了思路.As one of the most representative bioplastics,poly(lactic acid)(PLA)has been identified as an ecofriendly candidate for packaging medicine and food,holding distinct advantages of high strength and good biocompatibility.The application prospects,however,are largely dwarfed by the poor ductility and low resistance to gas permeation.In this work,the high-shear liquid exfoliation method was proposed to effectively transform the montmorillonite(MMT)to few-layer MMT nanosheets(MNSs),which thereby enabled in situ incorporation into the PLA matrix.Using a facile blade coating method,the fully biodegradable PLA nanocomposite films were prepared,with the MNS content ranging from 2%to 5%and 10%.The MNSs were found to be well exfoliated with a planar distance up to 3.11 nm,as accompanied by good alignment and strong interfacial adhesion within the composite films.These structural features conferred remarkable improvements in the mechanical properties and gas barrier performance for the composite films.This effort is of important significance for effective exfoliation of two-dimensional(2D)nanosheets,as well as fabrication of strong and high-barrier biodegradable nanocomposites.

关 键 词：聚乳酸 蒙脱土纳米片 液相剪切剥离 结晶形态 力学性能 阻氧性能 

分 类 号：O631[理学—高分子化学]