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Assessing PLA/PBSA Films for Sustainable Packaging for Moist and Perishable Foods.

Maria-Beatrice Coltelli1, Francesca Cartoni1, Luca Panariello1

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Summary
This summary is machine-generated.

This study explores Polylactic acid (PLA) and poly(butylene succinate-co-adipate) (PBSA) blends for sustainable food packaging. The research identifies promising biodegradable film formulations for high-moisture dairy products.

Keywords:
biobased filmsfood packagingpolylactic acid/polybutylene succinate-co-adipate blendswhey protein

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Area of Science:

  • Materials Science
  • Polymer Science
  • Sustainable Packaging

Background:

  • Petroleum-based plastics pose environmental challenges, driving demand for sustainable alternatives in food packaging.
  • Polylactic acid (PLA) is a promising biobased and compostable polymer, but its limitations in moisture barrier properties hinder applications in high-humidity food packaging.
  • Poly(butylene succinate-co-adipate) (PBSA) is a flexible and biodegradable polymer that can potentially enhance PLA properties.

Purpose of the Study:

  • To investigate immiscible Polylactic acid (PLA)/poly(butylene succinate-co-adipate) (PBSA) blend films as potential biobased packaging materials for perishable foods.
  • To systematically characterize the baseline barrier properties of unmodified PLA/PBSA blends in contact with liquid dairy products.
  • To identify optimal PLA/PBSA blend ratios for enhanced performance in high-humidity food packaging applications.

Main Methods:

  • Four PLA/PBSA blend ratios (30/70, 40/60, 50/50, 60/40 wt%) were prepared using micro-compounding and compression molding.
  • Films were characterized for thermal, morphological, and mechanical properties using techniques including FTIR, SEM, DSC, DMTA, and tensile testing.
  • Moisture barrier performance was evaluated by sealing fresh whey at 4°C and monitoring weight loss over 30 days under simulated dairy conditions.

Main Results:

  • Tensile strength and storage modulus (E') decreased with increasing PBSA content, indicating reduced stiffness.
  • Elongation at break showed a non-linear trend, suggesting complex morphological changes influencing ductility.
  • The study established baseline barrier properties of PLA/PBSA blends against liquid dairy, identifying specific ratios with superior performance.

Conclusions:

  • PLA/PBSA blends offer a viable pathway for developing biodegradable packaging for refrigerated, high-moisture food applications.
  • The mechanical and barrier properties of PLA/PBSA blends can be tailored by adjusting blend ratios for specific packaging needs.
  • This research provides crucial data for the scale-up and commercialization of these sustainable packaging materials for the food industry.