COLLOIDAL AND RHEOLOGICAL PROPERTIES OF ALUMINUM-OXIDE SUSPENSIONS CONTAINING POLYMER

Aggregation stability of aqueous suspensions of low concentration and processes of structure formation in concentrated hydrodisperions of al uminum oxide are investigated in the presence of high-molecular-weight compounds of different nature: poly(vinyl alcohol), polyoxyethylene, poly(methacrylic acid), and copolymer of maleic anhydride and styrene. The effect of polymer additives on the average dispersion characteris tics of suspensions and the degree of aggregation of aluminum oxide pa rticles are studied. The quantitative characteristics of the plasticit y of systems and the intensity of interparticle interaction are determ ined by means of characteristic indices and constants. The lower limit of structure formation in dispersions containing polymer is determine d, and the thickness of adsorbed solvation layers at the surface of al uminum oxide particles is estimated.