キチンに関する研究 : (第3報)グライコールキトザン塩酸塩の溶液粘度について
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概要
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With a view to investigate the specific character of glycol chitosan hydrochloride (GCH) as a positive polyelectrolye, viscosity, colloid titration curve, and effects of NaCl and pH on the viscosity of GCH solutions were measured. In water, the reduced viscosity of GCH increases sharply with diluton as in the case of other similarly constituted substances in which the polymer ion is oppositely charged (Table 1, Table 2, Fig. 1). Expansion of the polymeric coil due to intramolecular Coulomb repulsion is suggested as an explanation for the rise in viscosity on dilution. It is also confirmed that the reduced viscosity-concentration relationship follows the Seiyamas equation. The increase is suppressed in the presence of NaCl, and linear viscosity curves of the conventional type appear (Fig. 2). This explanation is attributed to the law of mass action. The viscosity of the GCH solution decreases rapidly as the pH of the solution is diminished by the addition of HCl (Fig. 3). In this case, it is the Cl ion from the added HCl that is responsible for lowering the viscosity of the GCH solution. When to the GCH solution (pH NaOH is gradually added so as to raise the pH, the viscosity curve also shows a similar fall. This is due to the conversion of GCH to GC, which remains undissociated. It is also verified from the colloid titration curve of the solution that the amino groups of GCH convert to the undissociated form at about pH 5.
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