In this work, 50/50 wt% blends of PLA and PBAT with and without a chain extender agent with
multifunctional epoxy groups (Joncryl ADR-4468) were prepared by ultrasound-assisted melt
blending in a Brabender chamber. The ultrasound parameters that were analyzed were the time
(0, 5, 10, and 15 minutes), the frequency (20±0.5 KHz), and the power (188, 375, 562, and 750 W)
applied. The torque rheograms showed an increase in the final torque when increasing the time
and power of ultrasound at a constant frequency, mainly in the blends prepared with a chain
extender. The complex viscosity of the blends without a chain extender gradually decreased with
time and ultrasound power at a constant frequency, while in the blends prepared with a chain
extender, an opposite effect was observed; the complex viscosity increased with increasing time
and ultrasound power. The compatibilized blends with the chain extender showed increased
Youngs modulus  and elongation at break compared to blends without an extender using the same
ultrasound conditions. The previous results indicate that the application of ultrasound favored the
compatibility of the immiscible PLA/PBAT blends with the chain extender agent.