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HYDROXY-m-PHENOXYCYCLOTRIPHOSPHAZENES OF REDUCED FUNCTIONALITY AND EPOXY OLIGOMERS BASED ON THEM
Abstract
The work is devoted to the synthesis of epoxy derivatives based on hexachlorocyclotriphosphazene. The aim of this study is to synthesize a new epoxyphosphazene binder with reduced functionality, due to which the mass fraction of phosphorus in the synthesized compound increases, as well as its viscosity decreases, which makes it possible to fine-tune the density of the network formed during the curing of the binder. To achieve this aim, the tasks of choosing of mono- and difunctional substituents of chlorine atoms in the initial cyclotriphosphazene and the design of a procedure for the synthesis of products with a high yield and required purity were solved. Derivatives of the general formula P3N3Clx(OPh)6-x (where OPh are phenol or p-acetamidophenol residues), x = 2-4, were used. Subsequent replacement of the remaining chlorine atoms in aryloxychlorocyclotriphosphazenes was carried out with resorcinol residues in acetonitrile in the presence of potassium carbonate as an acceptor of the released hydrogen chloride. The synthesis of epoxyphosphazene was carried out by the interaction of the obtained compound with an excess of epichlorohydrin in the presence of potassium hydroxide. The structure and composition of intermediate and final products were determined by 1H, 31P NMR spectroscopy and MALDI-TOF mass spectrometry. The synthesized epoxyphosphazenes have an epoxy number in the range of 11-12%, contain up to 13 wt% phosphorus and, when cured with standard epoxy resin hardeners, form non-combustible matrices. The degree of intermolecular interactions in the reactions carried out is very small, thus, the resulting compounds are nanosized. In further investigations, this will allow them to be used as effective modifiers of industrial brands of epoxy resins, which increase their thermal and fire resistance, as well as mechanical properties.
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