caa a22 4500 475763408 CHVBK 20180406123558.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/s003960050001 doi (NATIONALLICENCE)springer-10.1007/s003960050001 A calorimetric study of the acid dissociation of the conjugate acids of poly( N -vinylimidazole) and polyallylamine [Elektronische Daten] [H. Kodama, T. Miyajima, H. Tabuchi, S. Ishiguro] Thermodynamic parameters for acid dissociation of the conjugate acids of poly(N-vinylimidazole) and polyallylamine have been determined in the presence of sodium chloride and sodium nitrate. Even though the plots of ΔG 0 against the degree of dissociation, α, are highly dependent on the added salt concentration levels, the concentration effect has never been observed for the corresponding ΔH 0 versus α plots. The effect on the ΔG 0 versus α plots has been attributed to the entropy change of the counterions between a polyelectrolyte phase and a bulk solution phase. The α dependency of ΔH 0 is affected remarkably by the kinds of cationic polymers and counter-anions. Each ΔH 0 value at completely neutralized conditions is quite close to the corresponding ΔH 0 value of the monomer analog. The difference in the ΔH 0 values at fully charged conditions has been explained by the heats due to The ion-pair formation of chloride anion to the conjugate acids of poly(N-vinylimidazole) and polyallylamine has been supported by 35Cl NMR measurement. It has also been suggested that chloride anions bind the basic polymer molecules even at fully neutralized conditions. Springer-Verlag Berlin Heidelberg, 2000 Key words Poly(N-vinylimidazole) nationallicence Polyallylamine nationallicence Acid-dissociation equilibria nationallicence Calorimetric titration nationallicence 35Cl nuclear magnetic resonance nationallicence Kodama H. Department of Biological Resource Chemistry, Faculty of Agriculture Kyoto Prefectural University Kyoto 606-8201, Japan, JP aut Miyajima T. Department of Chemistry Faculty of Science and Engineering Saga University, Saga 840-8502, Japan e-mail: t-miyaji@cc.saga-u.ac.jp Fax:+81-952-288548, JP aut Tabuchi H. Department of Chemistry and Physics Graduate School of Science Kyushu University Fukuoka 812-8581, Japan, JP aut Ishiguro S. Department of Chemistry and Physics Graduate School of Science Kyushu University Fukuoka 812-8581, Japan, JP aut https://doi.org/10.1007/s003960050001 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050001 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kodama H. Department of Biological Resource Chemistry, Faculty of Agriculture Kyoto Prefectural University Kyoto 606-8201, Japan, JP aut NATIONALLICENCE 700 1- Miyajima T. Department of Chemistry Faculty of Science and Engineering Saga University, Saga 840-8502, Japan e-mail: t-miyaji@cc.saga-u.ac.jp Fax:+81-952-288548, JP aut NATIONALLICENCE 700 1- Tabuchi H. Department of Chemistry and Physics Graduate School of Science Kyushu University Fukuoka 812-8581, Japan, JP aut NATIONALLICENCE 700 1- Ishiguro S. Department of Chemistry and Physics Graduate School of Science Kyushu University Fukuoka 812-8581, Japan, JP aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer