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Optimizing interfacial adhesion in PBAT/PLA nanocomposite for biodegradable packaging films.

Shuo Qiu1, Yikai Zhou1, Geoffrey I N Waterhouse2

  • 1College of Chemistry and Material Science, Shandong Agricultural University, Tai'an 271018, PR China.

Food Chemistry
|July 21, 2020
PubMed
Summary

Nano-polyhedral oligomeric silsesquioxane (POSS(epoxy)8) enhances biodegradable poly(butylene adipate-co-butylene terephthalate)/poly(lactic acid) (PBAT/PLA) films. This improves mechanical and barrier properties for superior food packaging applications.

Keywords:
Biodegradable packaging filmCompatibilityPBATPLAPOSS

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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Biodegradable plastics like PBAT/PLA are crucial for sustainable packaging.
  • Improving the interfacial adhesion and barrier properties of PBAT/PLA blends is essential for enhanced performance.
  • Reactive compatibilizers are needed to effectively integrate different polymer phases.

Purpose of the Study:

  • To develop high-performance biodegradable PBAT/PLA films using nano-polyhedral oligomeric silsesquioxane (POSS(epoxy)8) as a reactive compatibilizer.
  • To investigate the effect of POSS(epoxy)8 on the structural, morphological, mechanical, and gas permeability properties of PBAT/PLA films.
  • To evaluate the performance of the developed films in food storage applications.

Main Methods:

  • Melt processing was used to incorporate POSS(epoxy)8 into PBAT/PLA blends.
  • 1H NMR and Gel Permeation Chromatography (GPC) were employed for structural analysis.
  • Scanning Electron Microscopy (SEM) was used to examine film morphology.
  • Mechanical testing and gas permeability measurements (water vapor, CO2, O2) were conducted.

Main Results:

  • POSS(epoxy)8 was chemically bound at the PBAT/PLA interface via epoxide ring opening.
  • SEM confirmed improved interfacial adhesion between PBAT and PLA matrices due to POSS(epoxy)8.
  • Mechanical properties (strength, toughness) and barrier properties (reduced permeability) of PBAT/PLA films were significantly enhanced.
  • Films containing POSS(epoxy)8 outperformed pristine PBAT/PLA and polyethylene films in food storage tests.

Conclusions:

  • POSS(epoxy)8 acts as an effective reactive compatibilizer for PBAT/PLA blends.
  • The addition of POSS(epoxy)8 leads to superior biodegradable plastic packaging films with enhanced mechanical and barrier characteristics.
  • This strategy offers a simple route to produce high-performance, sustainable packaging materials.