Copolymer P (BS-co-LA) Enhanced Compatibility of PBS/PLA Composite

The copolymer P(BS-co-LA) with various block chains are synthesized and employed as the interface linker in poly(butyl succinate) (PBS)/polylactic acid (PLA) blends to enhance the compatibility of PBS and PLA. The crystallization and rheological properties are determined by various methods, as well as the mechanical properties. The results indicate that the addition of P(BS-co-LA) decreases the crystallization temperature and degree of crystallinity in the PBS/PLA composite. The P(BS-co-LA) with a long-block chain remarkably enhances the compatibility of PBS/PLA composites than short block chains, and the PBS/PLA/P(BS-hb-LA) composites show great elongation at break and impact strength. Besides, the crystallinity and the rate of crystallization are increased, which are also observed by the X-ray diffraction. All approaches lead to the same result that P(BS-co-LA) with the long block chain is an excellent compatibility agent to enhance mechanical properties of the PBS/PLA composites.