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

Autor:	G. V. Malkov, A. N. Babin, N. N. Panina, A. I. Tkachuk, Ya. M. Gurevich, L. V. Chursova
Rok vydání:	2015
Předmět:	Materials science Polymers and Plastics General Chemical Engineering General Chemistry Epoxy Epoxy matrix Oligomer Physical network Catalysis chemistry.chemical_compound chemistry visual_art Polymer chemistry Urea visual_art.visual_art_medium Curing (chemistry)
Zdroj:	Polymer Science Series D. 8:266-269
ISSN:	1995-4220 1995-4212
DOI:	10.1134/s1995421215040048
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::34c7eed41864b6ce35df9fd36b10624e https://doi.org/10.1134/s1995421215040048 Zobrazit plný text záznamu Full text from SpringerLink