<研究報告>アルギン酸およびその誘導体の物理化学的性質の研究(II) : アルギン酸ソーダ水溶液のpHおよび粘性の経時変化について

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As is already well known, polyelectrolyte solution shows various abnormalities. Here in this experiment, the abnormal phenomena of pH of sodium alginate aqueous solution have been studied. The results are as follows: Sodium alginate solution indicates acidity immediately after dissolution, but it becomes alkaline by the dilution with distilled water (pH=6.71) (Fig.1). And it seems that the above-mentioned phenomena are common to all poly-weak-electrolyte. The pH of sodium alginate aqueous solution (0.5 %) at 24 hours after dissolution has relation with intrinsic viscosity; The higher intrinsic viscosity is, the lower its pH is (Fig. 2). When sodium alginate aqueous solution was left at 25℃., the rapid rising of pH in the solution is seen during two weeks without reference to the value of intrinsic viscosity, but its pH is fixed after 25 days (Fig. 3). And the decrease of intrinsic viscosity is over after nearly two weeks (Fig. 4), too; the changes of pH and intrinsic viscosity which are effected with the lapse of time indicate a mutually contrary tendency in sodium alginate aqueous solution (Fig. 2,4). But in spite of the decrease of viscosity, the abnormal change of pH is observed slightly in partial neutralized alginic acid and never in alginic acid (Fig. 5), and it is recognized that the change in course of time of relative viscosity is minimum at the degree of neutralization of 50% in partial neutralized alginic acid.
福岡女子大学の論文
1968-09-30

<研究報告>アルギン酸およびその誘導体の物理化学的性質の研究(II) : アルギン酸ソーダ水溶液のpHおよび粘性の経時変化について

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