Abstract
LAOS studies were carried out on untreated and ultrasonically treated ESO/nanoclay 30B colloids obtained by means of an ultrasonic twin-screw extruder at 100 and 400 rpm and ultrasonic amplitudes of 5, 10 and 13 μm. Obtained results were used to perform Fourier transform. Waveform, 3D stress response, elastic and viscous Lissajous curves show significant differences between the untreated colloids and colloids treated at 10 and 13 μm. G1′ and G1″ of colloids are increased with increase of ultrasonic amplitude, as a result of better nanoclay dispersion at higher ultrasonic amplitudes. A higher screw rotation speed also improved nanoclay dispersion for untreated colloid and colloid treated at 5 μm. However, for colloid treated at 10 and 13 μm, a lower screw rotation speed resulted in a better dispersion. This is due to less asymmetric bubble collapse and more jet flow in ultrasonic zone at lower screw speed, which promotes dispersion. Colloids treated at 10 and 13 μm showed yielding and then a non-linearity at a higher strain amplitude compared with untreated colloids. The values of GM′ and ηL′ of colloids calculated from intracycle data exhibited the densification and filler network breakup much more observable than those seen on values of G1′ and G1″. This means GM′ and ηL′ are more suitable for description of colloids with a two-step yielding behavior. Parameters S and T calculated based on intracycle data showed enormous differences in the strain hardening/softening and shear thickening/thinning behaviors between the untreated colloid and the colloids treated at 10 and 13 μm.
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