Kinetics of dispersion of cataphoretic resins as a function of the degree of neutralization
| Autor: | Minodora Leca, Marin Micutz |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Titration curve Tertiary amine General Chemical Engineering Organic Chemistry Inorganic chemistry Kinetics Aqueous two-phase system Salt (chemistry) Neutralization Surfaces Coatings and Films Dilution chemistry Polymer chemistry Materials Chemistry Dispersion (chemistry) |
| Zdroj: | Progress in Organic Coatings. 33:149-152 |
| ISSN: | 0300-9440 |
| Popis: | The kinetics of dispersion of a cataphoretic film-forming resin with tertiary amine groups using acetic acid as neutralizing acid was studied using pH as a measure of salt group formation for the degrees of neutralization 0.5, 0.6, 0.7, 0.8 and 0.9. A variation of pH during neutralization follows first order kinetics for all the degrees of neutralization. Equilibrium pH values obtained from kinetic curves are in good agreement with the final pH values of dispersions and with those measured after 7 days. The shape of curves pH= f ( t ) shows that the largest part of the neutralizing acid is present into the dispersed phase at any degree of neutralization but a small quantity, which increases with the degree of neutralization, remains into the aqueous phase. This conclusion is supported by the pH–metric titration curves of the amine monomer and of the resin and by the dilution of dispersion with water. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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