China Plastics ›› 2022, Vol. 36 ›› Issue (3): 58-63.DOI: 10.19491/j.issn.1001-9278.2022.03.010

• Materials and Properties • Previous Articles     Next Articles

Preparation and properties of crosslinked chitosan/montmorillonite composite films

XIE Yu1,3, WANG Limei2,3, QI Bin1,2()   

  1. 1.College of Pharmaceutical Sciences,Soochow University,Suzhou 215000,China
    2.College of Biological Engineering,Changshu Institute of Technology,Changshu 215500,China
    3.Key Laboratory of Food and Biotechnology of Suzhou,Changshu 215500,China
  • Received:2021-10-20 Online:2022-03-26 Published:2022-03-25

Abstract:

Crosslinked chitosan (CS)/montmorillonite (MMT) composite films were prepared through a solution intercalation method using CS as a matrix, MMT as a filler, and glutaraldehyde (GA) as a crosslinking agent. Their structure and properties were characterized using infrared spectroscopy, scanning electron microscopy, X?ray diffraction, and thermogravimetric analysis. The effect of MMT content on the water uptake, water vapor barrier and mechanical properties of the composite films were investigated. The results indicated that the composite films exhibited an improvement in water resistance, and their water uptake ratio decreased by 9.6 % compared to that of pure CS film. The introduction of MMT improved the water resistance, water vapor barrier property, mechanical performance, and thermal stability of the composite films. The composite films exhibited better comprehensive properties at a MMT content of 5 wt% in the CS domain. Compared to pure CS film, the composite films presented a decrease in water uptake ratio, water vapor transmission rate, and elongation at break by 37.3 %, 36.7 %, and 41.9 %, respectively. Their tensile strength increased by 160.5 %. The composite films exhibit potential applications as a food packaging material.

Key words: crosslinked chitosan, montmorillonite, composite film, water resistance, thermal stability

CLC Number: