Monolayer and multilayer biodegradable biocomposite blown films: Effect of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) and talc on mechanical and barrier properties

PHBV was incorporated into the PBSA matrix to boost stiffness and reduce oxygen and water vapor permeability. Extensional viscosity measurements were used to correlate rheological behavior with processability.

Incorporation of 15 wt% PHBV notably improved the modulus and barrier performance of PBSA films without significantly compromising their deformability, although strain hardening behavior decreased, leading to processing instability. Incorporation of reactive peroxide developed a strain hardening behavior in biocomposites based on ternary biopolymer blends, as confirmed by extensional viscosity data. The addition of talc further enhanced stiffness and barrier properties but resulted in a decreased elongation at break.