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High-Resilience and Cyclically Stable Bio-Based PBAT Composite Foams Enabled by Chain Extension and PEBAx Reinforcement
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DOI：10.1007/s10924-026-03925-0.png)
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Abstract
En 中文
Biodegradable poly(butylene adipate-co-terephthalate) (PBAT) foams are promising for sustainable applications, however, their inherent brittleness and poor dimensional recovery give rise to a dilemma between strength and elasticity. Herein, we challenge this trade-off by constructing a compatibilized microcellular blend consisting of PBAT and a bio-based polyether-block-amide (PEBAx) elastomer, with a multifunctional epoxy-based chain extender (CE) as a reactive compatibilizer. The CE formed graft copolymers at the interface, which significantly refined the phase morphology and enhanced interfacial adhesion-both of which were crucial for stabilizing the cellular structure during the foaming process. The optimized ternary foam exhibited a synergistic enhancement: a 227% increase in compressive strength, a 76.7% reduction in permanent deformation, and a 64% improvement in rebound resilience compared to neat PBAT foam, thereby effectively decoupling the conventional property trade-off. Critically, after 10 compression cycles, the PBAT/CE/PEBAx foam retained 92.5% of its initial strength with a low permanent set of only 5.5%, demonstrating exceptional fatigue resistance. This microstructural design strategy provides a pathway to high-performance, biodegradable foams suitable for high-demand applications by reconciling the conflict between load-bearing capacity and elastic recovery. Highly shrinkage-resistant PBAT foam with outstanding resilience. Exceptional resistance to mechanical fatigue. Ultralow thermal conductivity of only 41 mW/(m·K).
Keywords:
PBAT
Biodegradable foam
High resilience
Durable mechanical properties
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