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Abstract
The IR spectra of urea-formaldehyde oligomers synthesized in the presence of hexamethylene tetramine (HMTA) and ammonia have been investigated. Absorption bands relating to the triazinone ring have been identified, and the number of rings in the oligomer has been quantitatively evaluated on the basis on the absorption bands. The mechanism of formation of cyclic structures during the reaction of condensation of urea with formaldehyde is described and the role of HMTA and the influence of the HMTA concentration on the degree of substitution of the rings formed is revealed. A scheme of formation of cyclic structures is proposed.
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