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August 20, 2026MaterialsOpen Access

Binary Biopolymer Blends: Influence of Mixing Procedure on Mechanical Properties of Polymer Thin Films

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Authors

ANAleksandra NešićUniversity of Novi SadBPBranka PilićUniversity of Novi Sad

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Implication

Experimental study demonstrates double melt processing enhances ductility in polylactic acid blends, indicating thermal reprocessing improves bioplastic flexibility.

Key Points

  • To evaluate whether single-pass melt blending, plasticizer addition, or double melt processing best overcomes the brittleness of polylactic acid (PLA) thin films.
  • Formulated PLA blends with poly(butylene adipate-co-terephthalate) (PBAT) or poly(butylene succinate) (PBS) at 10, 20, and 30 wt% using single-pass and double melt processing.
  • Incorporated poly(ethylene glycol) (PEG 4000 or PEG 20000) plasticizer at 1, 3, and 5 wt% into single-pass blends.
  • Characterized thin films using tensile mechanical testing, differential scanning calorimetry (DSC), FTIR, SEM, contact angle measurements, and two-way ANOVA.
  • Double melt processing increased elongation at break to ~137% in 70PLA/30PBAT films compared to 16.9% in single-processed controls, yielding statistically significant relative increases of 98% (80PLA/20PBAT), 175% (80PLA/20PBS), and 278% (90PLA/10PBAT) (p < 0.05).
  • PEG addition altered maximum stress by at most ~18% and never increased elongation at maximum stress beyond 6%, with two-way ANOVA showing blend ratio significantly affected maximum stress (p < 0.001) while PEG molecular weight did not (p > 0.10).
  • DSC showed reduced glass transition temperatures (Tg) and altered crystallization in double-processed blends, whereas contact angle wettability remained consistent across all formulations.

Cite This Study

Nešić et al. (2026) studied this question.

synapsesocial.com/papers/6a86b57f8a91293e6a1ccf55https://doi.org/10.3390/ma19163485
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