Facile fabrication of fully biodegradable and biorenewable poly (lactic acid)/poly (butylene adipate-co-terephthalate) in-situ nanofibrillar composites with high strength, good toughness and excellent heat resistance
2020
Liu, Tong | Lian, Xinghan | Li, Lengwan | Peng, Xiangfang | Kuang, Tairong
Fully biodegradable and renewable polymer materials have shown broad application prospects with minimal environmental degradation. In the current study, eco-friendly poly(lactic acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) in-situ nanofibrillar composites with hierarchical crystal architectures, high mechanical performance and excellent heat resistance properties were fabricated using the loop oscillating push-pull molding (LOPPM) technique and in-situ PBAT nanofibrils were used to induce highly oriented hybrid shish-kebabs. Benefiting from the flow-induced crystallization and abundant hybrid shish-kebabs, the overall crystallinity of LOPPM-processed PLA/10 wt%PBAT sample increased by 4-fold than the conventional injection-molded (CIM) neat PLA sample. The present work indicated that the tensile strength, Young's modulus, elongation at break and impact strength of LOPPM-processed PLA/10 wt%PBAT were higher than the CIM-processed PLA by 36.2%, 12.5%, 181.8% and 253.7%, respectively. The vicat softening temperature was elevated from 59.6 °C to 104.8 °C, and the thermostability also enhanced due to the construction of hybrid shish-kebabs. Strong, tough and heat-resistant PLA/PBAT in situ nanofibrillar composites exhibited outstanding properties for use under more demanding circumstances and are environmentally friendly.
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