Determination des constantes d'association des paires d'ions et des ions triples au sein de solutions de poly (vinyl-2 pyridine) vivantes |
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| Authors: | G Kargier M Tardi P Turq |
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| Institution: | Laboratoire de Chimie Macromoléculaire, associé au CNRS, Université de Paris VI, Tour 44, 4, Place Jussieu 75005 et Laboratoire d''Electrochimie, Université de Paris VI, Bâtiment F, 10, rue Cuvier 75005, Paris, France |
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| Abstract: | The association constants KA and kA for ion-pairs and triple-ions in living polymer solutions of 2-vinyl pyridine have been measured. The values of KA and kA in tetrahydrofuran are respectively 4·6 × 108 and 5·2 × 104 with Na' as counter ion, and 6·6 × 108 and 1·6 × 102 with Cs+ as counter ion. These values fit in very well with kinetics recently published.In order to evaluate KA and kA more accurately, the translation diffusion coefficients of living or dead poly(2-vinyl pyridine) have been measured, monitoring the concentration gradient along an optical cell. In both cases for DP = 8, the value is 0366 cm2/sec. Such a value implies that the equivalent conductance of the poly 2-vinyl pyridine anions is lower than that of polystyrene anions of the same DP. |
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