| Titre : |
Macroscopic volume, van der waals volume and free volume after cure versus chemical conversion for a high-Tg epoxy/amine thermosetting system |
| Type de document : |
texte imprimé |
| Auteurs : |
R. A Venditti, Auteur ; J. K. Gillham, Auteur ; Y. Lou, Auteur ; Y. C. Jean, Auteur |
| Année de publication : |
1995 |
| Article en page(s) : |
p. 47-56 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Calorimétrie
Dilatation (thermodynamique)
Epoxydes
Polyamines
Positons -- Annihilation
Réticulation (polymérisation)
Thermodurcissables
Transition vitreuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
sothermal glassy-state properties of cured thermosetting materials pass through maximum and minimum values with increasing chemical conversion. In this work a diglycidyl ether of bisphenol A (a diepoxide) and trimethylene glycol di-p-aminobenzoate (a tetra-functional aromatic diamine) system (DGEBA/TMAB) has been investigated for the purpose of analyzing the behavior after cure of the isothermal properties of the glass with increasing conversion. The glass transition temperature (Tg) is used as a direct measure of conversion. The density, Tg, modulus, and free volume of the material after cure with increasing conversion was measured. The specific volume at 25°C after cure passes through a minimum and the modulus passes through a maximum with increasing conversion (Tg). The fractional fraction free volume at 25°C after cure passes through a minimum value with respect to conversion. The specific volume, modulus, and fractional free volume at 25°C versus conversion data qualitatively correlate |
| Note de contenu : |
- EXPERIMENTAL : Chemical system - Mixing procedure - Cure procedure - Density measurements - DSC measurements - Thermal expansion coefficient measurements - positron annihilation spectroscopy
- RESULTS AND DISCUSSION : Specific volume versus conversion - Packing density at 298K versus conversion - Comparison of van der waals volume and specific volume versus conversion - Free volume versus conversion - Antiplasticization |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18512 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 844 (05/1995) . - p. 47-56
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