In current effort, styrene-butadiene-styrene block copolymer () and polycarbonate (PC) were added to polypropylene (PP) to increase the application window of PP. Rheology and morphology of ternary blends of PP/PC/ (70/15/15) were examined in absence (neat) and in presence of organically modified nanoclay fillers. Surface energy values of three constituent polymers were assessed using contact angle (CA) goniometry and used for preliminary prediction of the morphology of neat ternary blends. Scanning electron microscope (SEM) was employed for examining the effect of mixing order of components in an internal compounder on the resulting morphology of PP/PC/ blends. A good agreement was found between CA and SEM results, where a separated dispersed morphology of PC and droplets was visible. A twin-screw extruder (TSE) was utilized to mix Cloisite 20A and Cloisite 30B nanoclays, in 3 phr concentration, with above-mentioned polymers to render nanofilled PP/PC/ blends. SEM, X-ray diffraction, and transmission electron microscope (TEM) were used to characterize the resulting morphology. XRD data showed that an intercalated morphology was obtained, particularly in the case of Cloisite 20A. TEM confirmed that nanoclay fillers preferred to be located mainly inside the PP matrix rather than interfaces and droplets. Rheological data revealed that Cloisite 20A increased viscosity and modulus of the nanofilled blends more than Cloisite 30B. In addition, the solid-like behavior was seen in low-frequency terminal region of the modulus-frequency curve and was assigned to the physical network formed because of the nanoclay presence. This motivated us to incorporate Cloisite 20A in different concentrations, 1 and 5 phr, and measure viscoelastic properties. It was observed that viscosity and modulus were maximum at 5 phr nanoclay content. Keywords: Morphology, Rheology, Ternary Blend, Styrene-Butadiene-Styrene Block Copolymer, Polycarbonate, Nanoclay
