A study of the dicyandiamide–epoxidian oligomer system curing in the presence of asymmetric urea by pulsed NMR

Catalyzed epoxy systems comprising epoxidian oligomer ED-20, dicyandiamide (DCDA) as a curing catalyst and asymmetric urea as an accelerator (Dyhard-UR500) were studied by pulsed NMR. It was shown that full curing of the epoxy composition with formation of a rigid three-dimensional network is achiev...

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Bibliographic Details
Published inPolymer science. Series D, Glues and sealing materials Vol. 8; no. 4; pp. 266 - 269
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 01.10.2015
Subjects
Chemistry
Chemistry and Materials Science
Polymer Sciences
dicyandiamide
latent curing systems
pulsed NMR spectroscopy
epoxy binders
asymmetric ureas
curing catalyst
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Summary:Catalyzed epoxy systems comprising epoxidian oligomer ED-20, dicyandiamide (DCDA) as a curing catalyst and asymmetric urea as an accelerator (Dyhard-UR500) were studied by pulsed NMR. It was shown that full curing of the epoxy composition with formation of a rigid three-dimensional network is achieved when cured in the conditions specified in the previous works of the authors. While at 80°C curing reaction practically does not proceed, thermostating of the composition for 6.5 h at 110°C leads to the formation of a physical network in partially cured epoxy matrix.
ISSN:1995-4212
1995-4220
DOI:10.1134/S1995421215040048