| Titre : |
The search for improved alternatives in epoxy toughening : New research shows the performance benefits of glycidyl esters |
| Type de document : |
texte imprimé |
| Auteurs : |
William Starner, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
p. 19-23 |
| Langues : |
Américain (ame) |
| Catégories : |
Adhésifs -- Additifs
Adhésion
Bisphénol A
Epoxydes
Esters de glycidyle
Formulation (Génie chimique)
Plastifiants
Transition vitreuse
Viscosité
|
| Index. décimale : |
668.3 Adhésifs et produits semblables |
| Résumé : |
The test results demonstrate that the modifiers examined in this study, whether adducted or glycidated, provide significant advantages in performance properties compared to the unmodified control formulation. Results also showed that glycidyl ester modifiers provide significant advantages over the bisphenol A epoxy adducts in their ability to reduce processing viscosity without sacrificing adhesive or toughener performance.
Other conclusions of the study include the following : The glycidyl ester modifiers are lower in viscosity and yield lower formulation mix viscosities than the industry benchmark.
Selection of the proper glycidyl ester will allow for higher Tg and desired adhesive and toughener performance.
The end group functionality appears to affect compatibility in the cured epoxy matrix, which in turn affects Tg. Glycidyl esters exhibit less compatibility than epoxy adducts and thus give higher Tg.
The study shows that adhesive properties are affected by the polymer backbone. Both polyester backbones and butadiene/acrylonitrile copolymer backbones provide good adhesion.
The best adhesion performance was achieved with glycidyl ester modifiers prepared using a CTBN.
No individual modifier will yield optimal results in all applications. The results of this study, however, demonstrate that there are newer alternatives with the potential to deliver better performance results in applications in which a low-viscosity modifier is needed. Glycidyl esters offer a number of advantages over the industry benchmark and, therefore, should be considered as the market continues to move toward products that are both energy- and cost-efficient. |
| Note de contenu : |
- STUDY DESCRIPTION
- MODEL FORMULA AND TEST PROTOCOL
- RESULTS AND DISCUSSION : Bisphenol A epoxy adducted modifiers - Glycidyl ester modifiers
- FIGURES : 1. SEM micrographs of unmodified vs. modified cured epoxy formulations - 2. Backbone and end group structures
- TABLES : 1. Epoxy formulations using bisphenol A epoxy adducted esters as modifiers - 2. Epoxy formulations using glycidyl esters as modifiers |
| En ligne : |
http://www.adhesivesmag.com/articles/88175-the-search-for-improved-alternatives- [...] |
| Format de la ressource électronique : |
Web |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25906 |
in ADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 16, N° 6 (06/2009) . - p. 19-23
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