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<p>Polylactide (PLA) is brittle at ambient temperature and has insufficient barrier properties, which limits its packaging applications. Incorporating metal–organic frameworks offers an effective strategy to overcome these limitations. Zeolitic imidazolate framework-8 (ZIF-8) nanoparticles were synthesized at room temperature and incorporated into PLA matrices via solution casting method to create nanocomposite films. The ZIF-8/PLA composites were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, mechanical testing, and permeability assessment. The ZIF-8 particles showed a rhombic dodecahedral morphology with an average size of ~ 200&#xa0;nm and high crystallinity confirmed by XRD. The incorporation of ZIF-8 enhanced the toughness of PLA: elongation at break of the resultant PLA composites increased up to 9.47% at a loading of 0.2 phr of ZIF-8, representing a 2.7-fold improvement over neat PLA. A non-monotonic trend was observed for the barrier properties: the water vapor permeability decreased by up to 57% at 4.0 phr of ZIF-8, whereas the oxygen permeability peaked at six times that of pure PLA at 1.0 phr, respectively. These behaviors are explained by a newly proposed hydrophobicity–pore cooperative permeability model, which considers ZIF-8’s hydrophobicity, nanoporosity, and interfacial compatibility with the polymer matrix. The ZIF-8 modified PLA composites maintained high optical transparency (&gt; 84% at 700&#xa0;nm) and demonstrated balanced multifunctionality, highlighting their potential in advanced packaging, sensing, and responsive material applications, although the thermal stability decreased slightly owing to the catalytic effects.</p> Graphical abstract <p></p>

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Tunable barrier properties and enhanced toughness in ZIF-8/polylactide nanocomposite films enabled by a hydrophobicity-pore cooperative mechanism

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Tao Qiang,
  • Wei Han,
  • Muhammad Yasar,
  • Yingying Liu

摘要

Polylactide (PLA) is brittle at ambient temperature and has insufficient barrier properties, which limits its packaging applications. Incorporating metal–organic frameworks offers an effective strategy to overcome these limitations. Zeolitic imidazolate framework-8 (ZIF-8) nanoparticles were synthesized at room temperature and incorporated into PLA matrices via solution casting method to create nanocomposite films. The ZIF-8/PLA composites were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, mechanical testing, and permeability assessment. The ZIF-8 particles showed a rhombic dodecahedral morphology with an average size of ~ 200 nm and high crystallinity confirmed by XRD. The incorporation of ZIF-8 enhanced the toughness of PLA: elongation at break of the resultant PLA composites increased up to 9.47% at a loading of 0.2 phr of ZIF-8, representing a 2.7-fold improvement over neat PLA. A non-monotonic trend was observed for the barrier properties: the water vapor permeability decreased by up to 57% at 4.0 phr of ZIF-8, whereas the oxygen permeability peaked at six times that of pure PLA at 1.0 phr, respectively. These behaviors are explained by a newly proposed hydrophobicity–pore cooperative permeability model, which considers ZIF-8’s hydrophobicity, nanoporosity, and interfacial compatibility with the polymer matrix. The ZIF-8 modified PLA composites maintained high optical transparency (> 84% at 700 nm) and demonstrated balanced multifunctionality, highlighting their potential in advanced packaging, sensing, and responsive material applications, although the thermal stability decreased slightly owing to the catalytic effects.

Graphical abstract