Biodegradable blends of poly(lactic acid) and poly (butylenes succinate) with improved compatibility, mechanical and thermal properties biodegradable

摘要

Fully biodegradable blends of PLA/PBS with different content of highly tailored epoxy functional styrene-acrylic oligomers(EFSAO) were prepared by a laboratory-scale twin-screw extruder at 170°C. The effect of EFSAO content on the morphology, mechanical properties, thermal behavior was investigated by mechanical test, DSC, and SEM respectively. Percentage elongation at break and notched Izod impact strength of PLA/PBS/EFSAO increased with EFSAO addition increased from 0.1phr to 1.5phr. However, tensile strength and modulus values changed slightly. The result of DSC thermograms of blends showed that the blends had more parts of amorphous phases. Morphology showed a great improved compatibility compared against the two polymers without compatibilizer which had clear partial phase immiscibility. With the reactive compatibilizer, PBS particles dispersed well in PLA and changed to smaller size, suggesting that the epoxy functional group react with -OH between PLA and PBS. With the improvment of toughness and other properties, the material would have more extensive applications in the near future.