par Stone-Masui, Jeannine;Watillon, André 
Référence Journal of colloid and interface science, 52, 3, page (479-503)
Publication Publié, 1975-09
Référence Journal of colloid and interface science, 52, 3, page (479-503)
Publication Publié, 1975-09
Article révisé par les pairs
| Résumé : | To get information about the surface charge, potentiometric and conductometric titrations have been carried out on monodisperse latices. Using these methods, strong acidic groups were detected for latices prepared in the presence of strong acid soaps. Similarly, for latices prepared with weak acid soaps, weak acidic groups were observed even after several purifications with mixed-bed ion exchange resins used in a batch procedure. The influence of the soap chain length on the surface charge has been investigated. An increase of the hydrophobic part of the soap leads to higher surface charges. Furthermore, surface charge-ionic strength relationships were established, which allowed us to calculate the surface dissociation constant of the weak acidic groups. The problem of the origin of surface charge has also been considered by comparison between the aforementioned data and information from molecular weight distribution of the polystyrene chains obtained by gel permeation chromatography. Other latices prepared in the same experimental conditions as for emulsion polymerization but without any soap were also studied. © 1975. |
