| Titre : |
Dimethyl secondary amine chain extenders : a conceptual approach to in situ generation of advanced epoxy resins for rapid-cure, low-VOC coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Frederick H. Walker, Auteur ; Rob Rasing, Auteur ; Gamini A. Vedage, Auteur ; Michael Cook, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
p. 283-313 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Tags : |
Poly(N-methylazetidine) Dimethyl-meta-xylylenediamine Pseudo-first-order kinetic Amine reactivity epoxy curing agent Epoxy resin coating Flexibility Crosslink density Miller-Macosko calculation Chain extender VOC Low temperature cure Environmental movement Electrochemical impedance Aine reaction mechanism Mannich base |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Advanced epoxy resin oligomers have traditionally been utilized for coatings that combine fast dry-to-touch speed and good flexibility--properties demanded in many markets such as marine and industrial maintenance coatings. Unfortunately, advanced epoxy resins require formulation with large quantities of solvent that make attainment of modern VOC regulations difficult or impossible. Coatings formulated from low molecular weight liquid epoxy resin, on the other hand, can easier meet VOC challenges, but dry slowly and tend to be brittle. This presentation explores the concept of using fast reacting, di-functional amine chain extenders to generate epoxy oligomers in situ as a means to meet these opposing property demands. Methylamine-terminated poly-(N-methylazetidine) (pNMAz, 1) is prepared in a two-step process involving the Michael addition of methylamine to acrylonitrile, followed by hydrogenation in a methylamine-containing atmosphere to yield an oligomer stream with an [M.sub.n] of about 250. Competitive pseudo-first-order kinetic measurements conducted in isopropyl alcohol indicate methyl-substituted disecondary diamines reacted approximately 3 to 3.6 times faster with phenyl glycidyl ether (PGE) than the primary amine meta-xylylenediamine (MXDA). These chain extenders can be formulated with traditional multi-functional amine crosslinkers to yield coatings with lower VOC, faster dry speed, and better flexibility compared to corresponding coatings formulated without the chain extender. |
| DOI : |
10.1007/s11998-009-9178-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9178-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6111 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 283-313
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