Studying the rheological properties in the molten state of blends based on PLA/ABS and determining their mechanical properties

Abstract

A blend of PLA/ABS in ratios of (10/90,50/50) was prepared in a molten state using a single-screw extruder machine. The rheological properties were studied under various temperatures and high shear stresses using a capillary rheometer, the apparent shear stress transformations were plotted against the apparent shear rate at different temperatures (190, 200, 210, 220)⁰C, the flow index values (n) for the studied blend were determined, indicating that the plastic blend (n<1) belongs to a similar family of plastics. The Baekle curves were studied by analyzing the pressure transformations (P) with respect to the relative L/R ratio.and The Baekle

correction value (e) was determined Using this data the true viscosity (η) was estimated, showing that the true viscosity decreases with increasing shear stress and high true shear rate values.  

The mechanical properties of the blend were evaluated using a tensile testing machine. and the stress at break, yield stress, and Young’s modulus, were determined. It was observed that the stress at break increased with an increase in the proportion of ABS in the blend, while the Young’s modulus initially decrease and then starts to increase with an increase in the ABS ratio.