Interaction of poly(n,n-dimethyl-3,4-dimethylene pyrrolidinium chloride)(PDADMAC) with standard titanium(IV)
dioxide suspensions in aqueous sodium chloride solutions
Polimery 1997, No 1, 40
PDADMAC's (Mw=3.0•105 g mol-1) efficiency as flocculent was found to be related to the polymer conformation, to hydrodynamic properties of the strongly cationic polymer molecules, to the presence of a low-molecular-weight electrolyte and to the thermodynamic quality of the solvent in the sedimentation experiments involving standard TiO2 suspensions in distilled water and aqueous 0.1—2.0 M NaCl solutions. In a thermodynamically "good” solvent, PDADMAC exercises electrostatic and hydrophobic forces on TiO2 floccules, where as in a "bad” solvent it only assists flocculation of the NaCl-destabilized TiO2 floccules viaa hydrophobic association mechanism.
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