Studies on the electrochemical properties of copolymers of maleic acid, V : viscometric behaviors

Abstract

The viscosities of the maleic acid copolymers with styrene and vinyl acetate, which show electrochemically typical polydibasic characteristics, were studied mainly in aqueous medium and partly in acetone-water (1 : 1) mixture. The viscosity change due to the change in degree of neutralization at a given concentration reflected the polydibasic characteristics. The reduced viscosity as a function of concentration at a given degree of neutralization was studied at 25℃. Some data fitted Fuoss's equation for strong polyelectrolytes and some other did not fit. A general emipirical equation, ηsp/C=A/1-BC^π+D, was proposed for the viscometric data which did not fit Fuoss's equation. The values obtained for n in the above equation were constant at a given degree of neutralization and for a given polymer, and all were intermediate between one-half and one. The significance of n was discussed and the meanings of A and D in the above equation were also examined.