Abstract
A new molecular model for the complexation between carboxymethylcellulose (CMC) and alkaline—earth metal ions has been discussed through the change in relaxation time and radius of gyration of the polymer. Elongation of the relaxation time of the CMC main chain due to the complexation is inedependent of the choice of alkaline—earth metal ion, but depends only on the numbers of metal ions bound to CMC. The radius of gyration of CMC in aqueous systems is elongated by complexation. In the new model for the complexation, there are two possibilities for the complex site. The rotational angle around the bond between the neighbouring residues decreases with complex formation from ~60 to 21°.
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