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M. Zaborski, A. Vidal, E. Papirer


Properties of precipitated silicas as elastomer fillers


Polimery 1993, No 7, 319


DOI: dx.doi.org/10.14314/polimery.1993.319

Summary

Properties of precipitated silicas differing in specific surface, degree of its development and content and type of active centres were studied. By the esterification method, the concentration of silanol group accessible for methanol and hexadecanol was determined. It emerged from these determinations that a major part of -OH groups is situated in micropores or surface irregularities. These studies were supplemented by determinations of adsorption of water and of a homologous scries of polyamines (ethylenediamine to tetraethylenepcntamine). This gave information about surface development in precipitated silicas. It was demonstrated that chains of poly (silicic acid) are situated on the surface of precipitated silicas. The results of measurements of electrokinetic potential zeta of silicas in various media as well as of rheological properties of silica suspensions in squalcne led to the conclusion that the degree of surface development only slightly influences its hydrodynamic effect, that is the behaviour of silica in a hydrocarbon medium. Modification of surface with alcohols or polyamines has a more pronounced influence.


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