Stress relaxation of alginate gels crosslinked by various divalent metal ions.
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概要
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Rheological properties of Alginate (Alg) gels were studied by measuring tensile stresses under small strains. The Alg gel rods were prepared in CaCl<SUB>2</SUB>, SrCl<SUB>2</SUB>, BaCl<SUB>2</SUB>, and Pb(NO<SUB>3</SUB>)<SUB>2</SUB> solutions in the range of 0.03–1.0 mol dm<SUP>−3</SUP>. Their stresses showed long relaxation processes. By curve fitting method, equilibrium elastic moduli <I>G</I><SUB>e</SUB>, spontaneous elastic moduli <I>G</I><SUB>e</SUB>+<I>G</I><SUB>r</SUB> and relaxation times τ were obtained. The results <I>G</I><SUB>e</SUB> were independent of strains γ, and <I>G</I><SUB>r</SUB> and τ increased as increasing γ. The effects of Ca ion concentrations <I>C</I><SUB>Ca</SUB> on the elasticities were discussed by taking account of the ratio of Ca ion bindings obtained by dialysis equilibrium and that of junction formation obtained by circular dichroism. The values of <I>G</I><SUB>e</SUB> were analyzed by the theory of swollen gels. The number of the junctions was found to be constant in the region of <I>C</I><SUB>Ca</SUB>>0.03 mol dm<SUP>−3</SUP>, and slight increases of <I>G</I><SUB>e</SUB> to be due to changes of the water content and the density of the Alg gels. The magnitudes of <I>G</I><SUB>e</SUB> and <I>G</I><SUB>r</SUB> depended on the kind of counterions, and decreased in the order, Ba->>Ca->Sr-> PbAlg; this was almost the same as that of the ion selectivities.
- 公益社団法人 日本化学会の論文
著者
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Yonese Masakatsu
Faculty Of Pharmaceutical Sciences Nagoya City University
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Kishimoto Hiroshi
Faculty Of Pharmaceutical Sciences Nagoya City University
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Baba Kazuhiko
Faculty of Pharmaceutical Sciences, Nagoya City University
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