Tri-layer degradable poly(butylene adipate-co-terephthalate) composite blown films: Effect of tie layer and uniaxial stretching in multilayer structures on their performance

Compared with tie-layer-free counterparts, the compatibilized multilayer films exhibited substantially improved interfacial cohesion, leading to enhanced impact resistance, approximately 38%, while minimizing the property losses typically associated with heterogeneous multilayer systems. Furthermore, the synergistic integration of mineral-reinforced outer layers, a starch-based core, reactive interfacial compatibilization, and uniaxial stretching produced degradable PBAT films with improved barrier performance, enhanced optical shielding, and robust structural stability without compromising processability.

This work demonstrates that MA-g-PBAT-enabled interfacial engineering is critical for realizing high-performance, filler-engineered biodegradable multilayer films and establishes a scalable manufacturing strategy for next-generation sustainable packaging materials with tailored multifunctional properties.