A study of the mechanism of curing of the dicyandiamide-epoxydiane oligomer system in the presence of asymmetrical urea

Catalyzed epoxy systems have been studied consisting of an ED-20 epoxy diane oligomer ED-20, a curing catalyst (dicyandiamide (DCDA)), and an accelerator (an asymmetric urea based on toluene diisocyanate). The chemical composition and structure of the catalyzed epoxy systems have been established by...

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Bibliographic Details
Published inPolymer science. Series D, Glues and sealing materials Vol. 8; no. 2; pp. 153 - 162
Main Authors Chursova, L. V., Tkachuk, A. I., Panina, N. N., Gurevich, Ya. M., Babin, A. N., Malkov, G. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2015
Subjects
Chemistry
Chemistry and Materials Science
Polymer Sciences
curing catalysts
dicyandiamide
latent curing systems
epoxy binders
polymer composites
unsymmetrical ureas
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Summary:Catalyzed epoxy systems have been studied consisting of an ED-20 epoxy diane oligomer ED-20, a curing catalyst (dicyandiamide (DCDA)), and an accelerator (an asymmetric urea based on toluene diisocyanate). The chemical composition and structure of the catalyzed epoxy systems have been established by IR and NMR spectroscopy in the initial and cured states. The influence of the composition of the complex catalyst system of curing on the mechanisms of chemical transformation of epoxy system has been considered. It is shown that the products of interaction of epoxydiane oligomers with DCDA in the presence of the accelerator-asymmetric urea of Dyhard UR500 brand-is a complex system consisting of chains of polyesters produced by a chain growth mechanism and amine sites, as well as interaction products of epoxy groups with imines, isocyanates, and hydroxyl groups with nitriles.
ISSN:1995-4212
1995-4220
DOI:10.1134/S1995421215020057