Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220316.doi: 10.7503/cjcu20220316

• Polymer Chemistry • Previous Articles     Next Articles

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

XU Huan1(), KE Lyu1, TANG Mengke1, SHANG Han1, XU Wenxuan1, ZHANG Zilin1, FU Yanan1, HAN Guangdong2, CUI Jinsheng2, YANG Haoran3, GAO Jiefeng4, ZHANG Shenghui1, HE Xinjian5()   

  1. 1.School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China
    2.Jining Haoke Technology Co. ,Ltd. ,Jining 272100,China
    3.Henan Key Laboratory of Surface and Interface Science and Technology,School of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China
    4.School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225200,China
    5.School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China
  • Received:2022-05-09 Online:2022-11-10 Published:2022-07-21
  • Contact: XU Huan,HE Xinjian E-mail:hihuan@cumt.edu.cn;xinjian.he@cumt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52003292);the Natural Science Foundation of Jiangsu Province, China(BK20200661);the China Postdoctoral Science Foundation(2020M681763);the Jiangsu Provincial Postdoctoral Research Foundation, China(2021K578C);the Fundamental Research Funds for the Central Universities, China(2021QN1115)

Abstract:

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.

Key words: Poly(lactic acid), Montmorillonite nanosheets, High-shear liquid exfoliation, Crystalline morphology, Mechanical property, Oxygen barrier performance

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