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 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18298 [article]

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