Abstract
The effect of high molecular weight polyacrylamide (PAAM; 5×106) and hydroquinone (HQ) on the sedimentation rate of kaolin suspensions was investigated by sedimentation, viscosimetric and UV spectrophotometric measurements. The sedimentation rates decreased exponentially with increasing HQ concentrations. PAAM solutions were prepared by dissolution of the same quantity of PAAM in aqueous HQ solutions with different concentrations. Viscosity of these solutions was observed to decrease exponentially with increasing HQ concentrations. Both the decrease in sedimentation rate and the viscosity were attributed to the reduction of the size of the macromolecular coil resulting from the breaking of intra- and intermolecular hydrogen bonds by HQ molecules. UV spectrophotometric results of the PAAM and HQ solutions were also in good accordance with the sedimentation and viscosimetric results.
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