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PALS free volume study of dry and water saturated epoxies / M. M. Madani in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 872 (09/1997)

[article]
inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 872 (09/1997) . - p. 45-54

Titre :	PALS free volume study of dry and water saturated epoxies
Type de document :	texte imprimé
Auteurs :	M. M. Madani, Auteur ; R. R. Miron, Auteur ; R. D. Granata, Auteur
Année de publication :	1997
Article en page(s) :	p. 45-54
Note générale :	Bibliogr.
Langues :	Américain (ame)
Tags :	'Epoxyde résine' 'Polymère réticulé' 'Peinture anticorrosion' Liant 'Volume libre' 'Annihilation positon' Glycol 'Bisphénol A' 'Température transition vitreuse' 'Indice vide' 'Inhibiteur corrosion' 'A sec' 'Saturation eau' 'Etude expérimentale'
Index. décimale :	667.9 Revêtements et enduits
Résumé :	Free volume cavity sizes and fractions of epoxy specimens were determined using positron annihilation lifetime spectroscopy (PALS). PALS data were obtained before and after specimen water equilibration. Specimens were bisphenol A epoxide (B) and/or glycol epoxide (G) cured with a polyamide. Free volume sites increased linearly and cavity sizes decreased linearly with epoxide B:G ratio. Glass transition temperature (Tg) increased with epoxide B:G ratio. Water molecules in wet epoxy B filled approximately six percent of the cavities. Epoxy G cavity size increased 11.4% after water equilibrium and was ascribed to cavity expansion. PALS results differed for commercial corrosion inhibitors in wet and dry mixtures of these epoxides.
Note de contenu :	- INTRODUCTION : PALS background - Polymer/water interactions - EXPERIMENTAL : Specimen preparation - PALS - RESULTS AND DISCUSSION : PALS of 100% epoxy B during cure at room temperature - Direct water uptake and PALS measurements - Free volume cavity concentration (dry) - Free volume cavity concentration (wet) - Free volume and water uptake - Inhibitors and epoxy mixtures - Models of protective coatings systems
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