無水マレイン酸-セチルビニルエーテル交互共重合体カリウム塩の水溶液中における溶存状態の経時変化

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To investigate the solution behavior of the polysoap (potassium salt of the alternating malefic anhydride and cetylvinyl ether copolymer, MW=6.0×105) which has the tendency of intermolecular association in water, ageing effect of the solution on the Zimm plot and of the reduced viscosity was examined. After heating at 70 °C for a day, the Zimm plot of the polysoap solution showed an unusual shape and the corresponding MW was 1×106, whereas following the four day storage at 70°C the established type of Zimm plot was obtaind and the MW was 5.9×105. This phenomena may be attributed to the disentanglement of the dissolved polysoap molecules which were entangled mechanically in the loops of other molecules. This may be a kind of disruption of the intermolecular aggregates of the polysoap, and then thermodynamically stable aggregates seem to be formed at equilibrium corresponding to the hydrophobic and hydrophilic balance of the polysoap. Also, it was noteworthy that the reduced viscosity greatly depended upon the previous thermal history of the polysoap solution. When the polysoap was dried up from the solution examined above and the reduced viscosity was measured again after heating, both the reduced viscosity and the pH of the solutions were lower than those of the initial solutions. This may be interpreted by the contraction of the polysoap because the polysoap increased its own hydrophobic property as the result of the partial hydrolysis of its carboxylate groups under the influence of atmospheric carbon dioxide. From the result, it is plausible that the features of polysoap (solubilization, dispersion and so on) depend upon the thermal history of the aqueous solutions.
社団法人日本油化学会の論文

無水マレイン酸-セチルビニルエーテル交互共重合体カリウム塩の水溶液中における溶存状態の経時変化

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