The ion‐exchange kinetics in polymer complexes was theoretically formulated. The regeneration of metal species from an ion‐exchange or chelate resin was described as a competitive reaction between metal ions and protons. We considered the ion‐exchange terms and the Langmuir terms to describe the rate of reaction, and film diffusion was also taken into account to describe the profile of the kinetics. In contrast to early methods, the surface concentrations were determined so that the rates of the chemical reactions and diffusion were self‐consistent. Although in the initial stage ion exchange was controlled by diffusion, in the last stage ion exchange was controlled by chemical reactions, particularly under excess acid. The kinetics were supported by experimental data for an iminodiacetic acid chelate resin and amidinourea resins. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39358.

As compared with echocardiographic parameters of LA size and LA function, AEMI appears to be more useful for identifying PAF patients. AEMI may enable to detect high risk PAF patients, especially those categorized into low risk by CHADS2 score.

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The substituent effects on the metal-ion-capturing function of amidinourea resins were investigated. The metal-ion-capturing function likely depends on the steric effects and/or hydrophilic/hydrophobic properties of the three substituents around the capturing sites. In order to clarify these points, we synthesized eight amidinourea resins having acyclic-and cyclic substituents with various numbers of carbon atoms. The adsorption analysis and the water-solubility test indicated that the hydrophilic/hydrophobic properties are more important for the metal-ion-capturing function than the steric effects. From the results including those with the unsubstituted amidinourea resin, we concluded that the optimized structure for metal-ion-capturing amidinourea resins is one with three methyl substituents.

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