<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(I) : 異なつた中和度をもつアルギン酸溶液の電気伝導度および粘性について

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Measurments are made concerning the viscosity, electric conductivity and electrolytic dissociation of partial neutralized alginic acid (PNA), and the results obtained are as follows; A-√<c> curves of all the PNA used show the abnormality as polyelectrolyte with any degree of neutralization, but when a degree of neutralization is about 50 per cent, the abnormality suddenly decreases and A_0 gets a minimum value ( Fig. 2, Table 1). Above-mentioned phenomenon is recognized also on the viscosity of PNA, the intrinsic viscosity and size of PNA molecule used show little variation at the degree of neutralization from 40 to 60 per cent (Table 2). The cause of the decrease of the degree of these abnormalities is assumed to be due to the small change of ionic atomosphere in and out PNA molecule by dilution, at the degree of neutralization of about 50 per cent (Fig. 5). Investigations were made on the influences of metallic ion on the electric conduc- tivity and viscosity of alginic acid or sodium alginate, and the results show that the order the fall of the electric conductivity and viscosity by the addition of metallic ion is as follows; Al>Mg>Ca>Ba (Fig. 7, 8).
福岡女子大学の論文
1967-11-25