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<p>Poly(pentylene adipate-<i>co</i>-terephthalate) (PPeAT) and polybutylene adipate-<i>co</i>-terephthalate (PBAT) were blended with poly(lactic acid) (PLA) at two different compositions and extruded into films. As a benchmark, low-density polyethylene was extruded into cast films as well and used as the reference material. Mechanical, crystal and barrier properties of the cast films were thoroughly investigated. PPeAT-based films showed stronger machine-direction (MD) orientation compared to PBAT films, leading to significantly reduced failure properties in the transverse direction. Incorporating PLA significantly increased Young’s modulus but reduced elongation at break, highlighting a clear stiffness–ductility trade-off. Barrier properties were only marginally affected by PLA incorporation, while tear and puncture resistance varied strongly with composition and orientation. The strong orientation in the MD remains a major challenge; however, if addressed, PPeAT-based cast films could offer strong potential as a drop-in replacement for low-density and linear low-density polyethylene in flexible packaging applications.</p> Graphical abstract <p></p>

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Structure–property relationships in PLA–PBAT and PLA–PPeAT blends: toward stronger biobased biodegradable packaging materials

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Hesham Aboukeila,
  • Mahdi Mazaheri,
  • Onkar Singh,
  • Emily Edwards,
  • George W. Huber,
  • John Klier,
  • Brian P. Grady

摘要

Poly(pentylene adipate-co-terephthalate) (PPeAT) and polybutylene adipate-co-terephthalate (PBAT) were blended with poly(lactic acid) (PLA) at two different compositions and extruded into films. As a benchmark, low-density polyethylene was extruded into cast films as well and used as the reference material. Mechanical, crystal and barrier properties of the cast films were thoroughly investigated. PPeAT-based films showed stronger machine-direction (MD) orientation compared to PBAT films, leading to significantly reduced failure properties in the transverse direction. Incorporating PLA significantly increased Young’s modulus but reduced elongation at break, highlighting a clear stiffness–ductility trade-off. Barrier properties were only marginally affected by PLA incorporation, while tear and puncture resistance varied strongly with composition and orientation. The strong orientation in the MD remains a major challenge; however, if addressed, PPeAT-based cast films could offer strong potential as a drop-in replacement for low-density and linear low-density polyethylene in flexible packaging applications.

Graphical abstract