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Development of Mono-Material Multilayer Light Barrier Films.

Rocío Ayelén Fuentes1,2, Giacomo Foli3, Roberta Di Carlo3

  • 1Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Bahía Blanca 8000, Argentina.

Polymers
|December 31, 2025
PubMed
Summary

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Polymers·2023

New mono-material multilayer polypropylene films with mineral fillers offer enhanced light barrier properties. These recyclable films provide improved UV protection and mechanical strength for packaging applications.

Area of Science:

  • Materials Science
  • Polymer Science
  • Packaging Technology

Background:

  • Conventional multi-material packaging poses recycling challenges.
  • Development of light barrier structures is crucial for photosensitive product protection.
  • Need for sustainable and high-performance packaging solutions.

Purpose of the Study:

  • To develop and characterize novel mono-material multilayer polypropylene films as light barriers.
  • To evaluate the impact of mineral fillers (talc, kaolinite) on film properties.
  • To assess the suitability of these films for photosensitive packaging.

Main Methods:

  • Fabrication of trilayer polypropylene films via thermocompression with varying mineral filler content (0-5 wt.%).
  • Characterization using Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD).
Keywords:
compositekaolinitelight barrier propertiesmineral particlesmono-materialmultilayer filmspolypropylenetalc

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  • Evaluation of mechanical, optical (light transmittance), and gas barrier properties.

    • Main Results:

    • Confirmed well-defined trilayer structures with no thermal degradation during processing.
    • Observed enhanced thermal stability, modified crystallinity, and preferential polymer crystal orientation.
    • Achieved improved stiffness and tensile strength without compromising sealability or puncture resistance.
    • Demonstrated significantly reduced UV and visible light transmittance while maintaining translucency.
    • Preserved gas barrier performance with minimal changes in permeability.

    Conclusions:

    • Mono-material multilayer polypropylene films incorporating mineral fillers are effective light barriers.
    • These films offer a recyclable and sustainable alternative to conventional multi-material packaging.
    • The developed films exhibit excellent UV protection, mechanical robustness, and preserved barrier properties.