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- Muto Nobuhiko
- Department of Polymer Science, Faculty of Science, Hokkaido University
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説明
The effect of counterions on the titration behavior of poly(itaconic acid) (PIA) was studied by titrating PIA in aqueous solutions containing alkali metal salts and a tetramethylammonium salt at 25°C. The acidity of the primary carboxylic groups of PIA increases in the order (CH3)4N+<Li+<Na+<K+, whereas that of the secondary carboxylic groups increases with the decrease in the crystallographical radii of the counterions, in the order (CH3)4N+K+<Na+<Li+, in agreement with the results for ordinary polycarboxylic acids. The order K+>Na+>Li+ on the binding strength to the primary carboxylate groups in the first dissociation step is interpreted in terms of the radii of the hydrated cations; it can be ascribed to the stable ring structure of the monoanion of the itaconic acid residue, resulting from the hydrogen bonding between two adjacent carboxylate groups. In apparent complete dissociation, about 80, 60, and 40% of the itaconate residues bind to Li+, Na+, and K+ ions, respectively, when it is assumed that no (CH3)4N+ ions are bound to the carboxylate groups.
収録刊行物
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 47 (5), 1122-1128, 1974
公益社団法人 日本化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679114024704
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- NII論文ID
- 130001973186
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- ISSN
- 13480634
- 00092673
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
