| Titre : |
Cure and morphology of epoxy/polyester powder coatings containing titanium dioxide : a thermally stimulated discharge study |
| Type de document : |
texte imprimé |
| Auteurs : |
Emile C. Trottier, Auteur ; Stanley Affrossman, Auteur ; Richard A. Pethrick, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 717-724 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Dioxyde de titane
Epoxydes
Mesures diélectriques
Polyesters
Réticulation (polymérisation)
Revêtements poudre:Peinture poudre
Stimulation électrique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
This article describes the use of thermally stimulated electrical discharge (TSD) measurements in the study of the cure processes occurring for a range of titanium dioxide, silica, and zinc oxide-pigmented epoxy polyester films. The unfilled polyester–epoxy resin system exhibits a simple TSD profile indicative of a combination of space charge and dipole relaxation processes. The addition of the Modaflow, which is used to aid in the dispersion of the pigment in the system, induces phase separation under certain cure conditions. In a number of systems, two lower temperature Tg peaks were initially observed, which collapsed into a single peak on post cure. The principal difference between the two grades of titanium dioxide was the size of the space charge peak, which is a direct indication of the mobile ion content in the material. The sulfate has higher mobile ion content than the chloride route material. Differences were observed between traces of silica and zinc oxide, which reflect the ability of the particles to interact with the resin and form a dense matrix. Silica at low concentrations is able to reduce the space charge peak which implies it can trap ions. The TSD study indicates that the pigments are able to change the morphology of the matrix which is being formed. |
| Note de contenu : |
- EXPERIMENTAL : Resins - Pigments - Thermally stimulated discharge measurements
- RESULTS AND DISCUSSION : Studies of the base resin system cured at 413K - Studies of the base resin system with Modaflow cured at various temperatures - Titanium dioxide pigments A and B - Silica and zinc oxide effects
- ACTIVATION ENERGY CALCULATIONS |
| DOI : |
10.1007/s11998-012-9410-1 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9410-1.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16657 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 6 (11/2012) . - p. 717-724
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