Cited by 2biodegradable polymer synthesis and propertiesPolymer crystallization and propertiesNanocomposite Films for Food Packaging

Engineering crystalline architecture in PLA/PBAT-based blend films through PDLA and talc for high-performance sustainable packaging

Bharathan, Smrithy Pullarkad, Guthige, Mahammad Riyaz, Kumar, Sunny, Kumar, Ranganathan, George, Johnsy·2026·International Journal of Biological Macromolecules

Abstract

The limited thermal stability, barrier performance, and inherent brittleness of polylactic acid (PLA) films restrict their widespread use in sustainable food packaging applications compared with conventional polyolefins. Although blending PLA with the compostable polymer poly(butylene adipate-co-terephthalate) (PBAT) is an effective approach in improving flexibility and melt processability, the intrinsically low crystallinity of PLA persists, resulting in suboptimal thermal and barrier properties. To address this challenge, a scalable dual-nucleation strategy was developed by combining poly(D-lactic acid) (PDLA)-induced stereocomplex crystallization with talc-promoted heterogeneous nucleation to enhance the crystallization behavior and functional performance of PLA/PBAT blend films. Films with varying PDLA and talc contents were fabricated via industrially relevant blown film extrusion. FTIR, XRD, and DSC analysis confirmed the formation of thermally stable PLA stereocomplex crystals in the presence of PDLA, leading to increased crystallinity. The addition of talc further accelerated heterogeneous nucleation, promoting faster crystallization and more compact crystalline structures in both the PLA and PBAT phases. In the modified film, improved mechanical properties and thermal stability were observed, while barrier measurements revealed reduced water vapor and oxygen transmission rates. Accelerated shelf-life testing of banana chips stored at 45 °C for 23 days confirmed better moisture control, texture retention, and oxidative stability. Overall, this work establishes PDLA-talc nucleated PLA/PBAT films as a sustainable, bio-based packaging candidate for food applications.

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Crossref · 10.1016/j.ijbiomac.2026.153379

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Authors
Bharathan, S. P., Guthige, M. R., Kumar, S., Kumar, R., & George, J.
Affiliations
Defence Food Research Laboratory (IN)
Corresponding author
George, Johnsy
Venue
International Journal of Biological Macromolecules
Publisher
Elsevier BV
Published
2026-09
Volume
374
Pages
153379
ISSN
0141-8130 (ISSN-L)
OpenAlex
W7167498156
Cited by
2
References
51
Citations by year
2026: 2
FWCI
3.04
Type
journal article
Language
en
Open access
closed
Locations
  • International Journal of Biological Macromolecules (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
  • Physical Sciences › Materials Science › Biomaterials › Nanocomposite Films for Food Packaging
Keywords
polylactic acid, poly(butylene adipate-co-terephthalate), poly(D-lactide), talc, stereocomplex crystallization, heterogeneous nucleation, blown film extrusion, food packaging, barrier properties, water vapor transmission, oxygen barrier, shelf life, banana chips, bio-based packaging, crystallinity
MeSH terms
Crystallization, Phthalic Acids, Polyesters, Talc, Food Packaging

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