On the solution viscosity of ionic polymers and their conformation in solutions
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概要
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The viscosity behavior of linear, flexible ionic polymers in solutions and its accepted interpretation were discussed. Experimental viscosity data by Yamanaka et al. were pointed out to show the α value of the Houwink-Mark-Sakurada equation being smaller than two, a value expected for rod-like conformation. The viscosity of latex dispersions, telechelic polymer solutions, and microgel dispersions showed that the intra-molecular interaction does not play a role as important as was supposed to be in the previous argument. The Booth theory of primary electroviscous effect of charged particles (distortion of ion cloud under flow) was found to be satisfactory in explaining dependencies of viscosity of colloidal particles on charge number (Q), size, and salt concentration, particularly for large κa (1/κ: Debyes radius, a: the particle radius) and at small Q. Taking into consideration that the macroion domain corresponds to extremely high concentrations of ionic groups, the formation of multiple ions by a counterion-mediated attraction, which was not considered so far, was tentatively suggested. Further, the contribution of localized ordered domains of macroions that were recently unveiled was suggested to be presumably influential in viscosity properties.