FORMATION OF A SURFACE COMPLEX BETWEEN POLYMER AND SURFACTANT AND ITSEFFECT ON THE DISPERSION OF SOLID PARTICLES

Formation of an intermolecular complex between a polymer and a surfact ant on the surface of a particle, and its effect on the suspension sta bility are discussed for the systems (1) kaolinite-sodium dodecyl sulf ate (SDS)polyvinylpyrrolidone (PVP), (2) kaolinite-SDS-hydroxypropylce llulose (HPC), (3) hydroxyapatite (HAP)-SDS-PVP, and (4) HAP-SDS-bovin e serum albumin (BSA). The complex is formed by electrostatic and hydr ophobic interactions, both of which often operate simultaneously. The effect of the surface complex on the suspension is explained in relati on to the mean diameter of the secondary particles and the rheological properties of the suspensions. The significance of these studies for physicochemical and biological sciences is briefly discussed.