Experimental Study of Immiscible Polymer Blends: Morphology and Rheology

This paper focuses on the relation between the rheological and the morphological properties of immiscible polymer blends. Polystyrene droplets (PS) have been synthesized in the laboratory. The blends of EVA2840/PS at ratios 90/10, 70/30, and 50/50 (wt%/wt%) were prepared by Rheomix HAAKE 600VR internal batch mixer with roller rotor. Rheological tests were made at a temperature of 140 °C. Rheological measurements using a rotational rheometer with parallel-plate geometry are considered in order to lead to a better understanding of the dispersion of the PS droplets. Rheological examinations showed that the storage, the loss moduli, and the complex viscosity of blends have an extra elasticity at lower frequency. As a result, analysis of Han diagrams revealed that EVA2840/PS blend are immiscible.