Abstract
Effects of ionic species on flow behavior of aqueous solutions of polyacrylamide (PAM) were experimentally investigated. Elastic property of PAM solution is transiently increased by addition of Fe^<3+> solution and then it is decreased to initial value. In order to elucidate this phenomenon, we investigated the Weissenberg effect of the solution. The phenomenon was explained by the interaction between Fe^<3+> and PAM solution.
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