PBS and its composites' rheological properties were analyzed using an Anton Paar MCR 301 oscillatory rheometer equipped with 25 mm diameter parallel plates and a 0.5 mm gap. The measurements were conducted at 140 °C. Preliminary tests were performed using the strain sweep mode (10 rad/s) in the 0.01-100% range to ensure later experiments were located in the linear viscoelastic (LVE) region. Angular frequency sweep measurements were performed at 5 % strain in the 0.05 to 500 rad/s range.