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<p>Environmental pollution caused by petroleum-based plastics has prompted extensive research into biodegradable packaging films, like cross-linked biopolymeric-based films. Safe and effective cross-linking agent selection was therefore important. In this study, malonic acid (MA) was the first time to be used as a cross-linker to strengthen the tensile and barrier properties of chitosan (CS)/polyvinyl alcohol (PVA) films. The results revealed that a denser and more homogeneous film structure was achieved, as a result of both hydrogen bond and electrostatic interactions. Consequently, the tensile strength (TS), water vapor barrier, oxygen barrier properties, surface hydrophobicity, and water resistance properties were all greatly strengthened due to the densified film structure and strong cross-linking interactions. However, excess MA addition would be a plasticizer, leading to weakened film properties. Therefore, the optimized film properties were achieved at a medium MA addition of 3%, with the TS of 147.3&#xa0;MPa, oxygen permeability of 0.42&#xa0;g/m<sup>2</sup>&#xa0;h (comparable to the commercial PVC film), and water vapor transmission rate of 2.61&#xa0;g/m<sup>2</sup>&#xa0;h, showing a high potential to be used in the environment-friendly packaging. The above findings supported MA to be used as an alternative cross-linker to develop CS-based films to obtain high strength and barrier properties to be used in green packaging.</p>

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Enhanced barrier and tensile properties of chitosan/polyvinyl alcohol composite film crosslinked by malonic acid

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Wanting Wu,
  • Wen Sun,
  • Shibo Qiu,
  • Hong Qian,
  • Bo Peng,
  • Kai Chen,
  • Kao Wu,
  • Gang Wei,
  • Fatang Jiang

摘要

Environmental pollution caused by petroleum-based plastics has prompted extensive research into biodegradable packaging films, like cross-linked biopolymeric-based films. Safe and effective cross-linking agent selection was therefore important. In this study, malonic acid (MA) was the first time to be used as a cross-linker to strengthen the tensile and barrier properties of chitosan (CS)/polyvinyl alcohol (PVA) films. The results revealed that a denser and more homogeneous film structure was achieved, as a result of both hydrogen bond and electrostatic interactions. Consequently, the tensile strength (TS), water vapor barrier, oxygen barrier properties, surface hydrophobicity, and water resistance properties were all greatly strengthened due to the densified film structure and strong cross-linking interactions. However, excess MA addition would be a plasticizer, leading to weakened film properties. Therefore, the optimized film properties were achieved at a medium MA addition of 3%, with the TS of 147.3 MPa, oxygen permeability of 0.42 g/m2 h (comparable to the commercial PVC film), and water vapor transmission rate of 2.61 g/m2 h, showing a high potential to be used in the environment-friendly packaging. The above findings supported MA to be used as an alternative cross-linker to develop CS-based films to obtain high strength and barrier properties to be used in green packaging.