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The blends and hybrid nanocomposites of polypropylene - cycloolefin copolymerwere prepared by a twin-screw extruder followed by microfibril formation usinga single screw extruder. The effects of shear rate and organoclay on themorphology of polypropylene - cycloolefin copolymer (PP/COC - 80/20 wt. %)blends were studied by using a combination of rheological measurements, X-raydiffraction (XRD) and scanning electron microscopy (SEM). It was found thatalthough the viscosity ratio of PP/COC blend was unfavorable for COC dropletdeformation, the COC phase was converted to finely dispersed fibrils in PPmatrix. This could be asserted to the high elasticity of the COC droplets thatsuppressed the droplet breakup in the favor of fibrillation process. The highglass transition temperature of COC (140 degree centigrade) could also assistrestoring the generated microfibril morphology upon cooling. The experimentalresults also depicted that the droplet deformation and microfibril formation ofPP/COC/organoclay nanocomposites mainly depend on the organoclay partitioning,which could be controlled predominantly by kinetic parameters. While thelocalization of organoclay in the PP matrix resulted in smaller COC dropletsand fibrils with smaller diameter, the presence of organoclay inside COCdroplets reduced the droplet deformability, leading to fibrils with largerdiameter.

Morphology of PP/COC composites: effects of shear rate and organoclay partitioning