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Open AccessArticle

Synthesis of Bisphenol A Based Phosphazene-Containing Epoxy Resin with Reduced Viscosity

1
Department of Plastics, Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, 125047 Moscow, Russia
2
Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, 119991 Moscow, Russia
3
Department of Organic Chemistry, Peoples′ Friendship University of Russia, Miklukho-Maklaya str.6, 117198 Moscow, Russia
4
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
5
Scientific & Research Institute of Natural Gases and Gas Technologies—Gazprom VNIIGAZ, Razvilka, s.p. Razvilkovskoe, Leninsky dist., Moscow region, 142717 Moscow, Russia
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1914; https://doi.org/10.3390/polym11121914
Received: 3 October 2019 / Revised: 10 November 2019 / Accepted: 16 November 2019 / Published: 20 November 2019
(This article belongs to the Section Polymer Synthesis)
Phosphazene-containing epoxy oligomers (PEO) were synthesized by the interaction of hexachlorocyclotriphosphazene (HCP), phenol, and bisphenol A in a medium of excess of epichlorohydrin using potassium carbonate and hydroxide as HCl acceptors with the aim of obtaining a product with lower viscosity and higher phosphazene content. PEOs are mixtures of epoxycyclophosphazene (ECP) and a conventional organic epoxy resin based on bisphenol A in an amount controlled by the ratio of the initial mono- and diphenol. According to 31P NMR spectroscopy, pentasubstituted aryloxycyclotrophosphazene compounds predominate in the ECP composition. The relative content in the ECP radicals of mono- and diphenol was determined by the MALDI-TOF mass spectrometry method. The organic epoxy fraction, according to gas chromatograpy-mass spectrometry (GC-MS), contains 50–70 wt % diglycidyl ether of bisphenol A. PEO resins obtained in the present work have reduced viscosity when compared to other known phosphazene-containging epoxy resins while phosphazene content is still about 50 wt %. Resins with an epoxy number within 12–17 wt %, are cured by conventional curing agents to form compositions with flame-retardant properties, while other characteristics of these compositions are at the level of conventional epoxy materials. View Full-Text
Keywords: epoxy resin; epoxy oligomer; phosphazene; bisphenol A; phenol epoxy resin; epoxy oligomer; phosphazene; bisphenol A; phenol
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Kireev, V.V.; Bilichenko, Y.V.; Borisov, R.S.; Mu, J.; Kuznetsov, D.A.; Eroshenko, A.V.; Filatov, S.N.; Sirotin, I.S. Synthesis of Bisphenol A Based Phosphazene-Containing Epoxy Resin with Reduced Viscosity. Polymers 2019, 11, 1914.

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