Processing and Rheological Behavior of ABS/ Montmorillonite Nanocomposites Via Single Screw Capillary Extrusion

摘要

Evidence for intercalated and exfoliated clay nano-structures was found in Acrylonitrile-butadiene-styrene/montmorillonite (MMT) compounds. Formulations with MMT from 0.5 to 9 vol. have been processed by single screw capillary extrusion. Melt rheology showed that the onset of shear thinning shifts to lower shear rates until one order in magnitude in shear rate (γ), as modified clay increases. On the other hand, the viscosity at zero shear (η0) augments in the order of 650 in the highest concentration sample. Furthermore, viscosity curves from capillary rheometry showed a strong shear thinning behavior as clay content is increased. From X-ray diffraction, it is inferred a nano-clay d-spacing increase independent from the clay content in capillary extrusion samples. Transmission Electron Microscopy shows intercalated/exfoliated clay structures from capillary extrusion. Proper processing conditions in conventional equipment for plastics transformation, may lead to obtain intercalated and exfoliated nanocomposites without complex tooling configuration.