アルギン酸およびその誘導体の物理化学的性質の研究(V) : アルギン酸ソーダ水溶液の屈折率について

概要

論文の詳細を見る
1. Δn/C vs. C curves of sodium alginate and carboxy methyl cellulose show an abnormal change, and the abnormality is similar to that of η_<sp>/C vs. C curve. C/Δn vs. √<C> curve also becomes linear at low concentrations, and those facts show that the relation between Δn/C and C can be explained by Fouss' empirical formula: η_<sp>/C=A/(1+B√<C>)(Δn=Refraction index of solution minus refraction index of solvent; C=Concentration of polymer; η_<sp>/C=Reduced viscosity) 2. When sodium chloride is added to sodium alginate aqueous solution, the refraction index of the solution decreases with the increase of salt concentration and Δn/C vs. C curve becomes linear at the salt concentration of 0.5 N and upwards. The above-mentioned effect of added salt appeared in the case of sodium sulfate as well, but Δn/C vs. C curve does not become linear. It is presumed that this difference found between the effects of added salt is due to the difference between the species of anion. 3. The curve of logΔn/C vs. [η](intrinsic viscosity) becomes linear in the limited intrinsic viscosity (in N-NaCl) range from about 0.26 to about 0.53 and the straight line is represented by the following formula: log((Δn/C))_<C→O>=4×10^<-4>e^<2・1[η]>
福岡女子大学の論文