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Open AccessArticle

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

Department of Plastics, Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, 125047 Moscow, Russia
Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, 119991 Moscow, Russia
Department of Organic Chemistry, Peoples′ Friendship University of Russia, Miklukho-Maklaya str.6, 117198 Moscow, Russia
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
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;
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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