SPECIFIC INTERACTIONS AND THE RHEOLOGY OF PIGMENTED POLYMER-SOLUTIONS

Rheological properties have been measured for solutions of polyesters containing quantities of inorganic and organic pigments. Complex behav ior patterns were simplified by computing the effective volume fractio n of dispersed solids, taking in account the thickness of polymer laye rs adsorbed on pigment surfaces. The dimension of interphases created by the adsorbed polymers was rationalized by applying principles of sp ecific interaction between polymers and pigment surfaces. The paramete rs of specific interaction were obtained from inverse gas chromatograp hic data. Pigment sedimentation data were used to identify a range of specific interactions best suited to stabilize dispersions of the soli ds. (C) 1996 John Wiley & Sons, Inc.