Properties and morphology of thermoplastic acetylated starch/polylactide composites

The polylactide(PLA) and thermoplastic acetylated starch(TPAS) composities were prepared by molten blending method, and the mechanical properties, thermal properties and morphology of TPAS/PLA composites were investigated. TPAS was prepared with acetylated starch as matrix and glycerol as plasticizer. The experimental results show that the toughness of TPAS/PLA composite was significantly improved with the increase of TPAS. The elongation at break of TPAS/PLA improves by four times as much as pure PLA with TPAS mass fraction of 40%. In addition, TPAS has little effect on the thermal stability of PLA/ATPS composites. DSC, dynamic mechanical analysis and SEM results indicate that PLA and ATPS are immiscible.