Abstract
A method has been devised for determining from the 13C NMR spectra the structure of the products of interaction of furfuryl alcohol with urea and formaldehyde. Hemiformals form in a neutral medium. Boiling at pH 5·5 leads to the formation of dimethylene ether bridges between the furane cycles and the nitrogen atoms of the urea residues so that the additive is chemically incorporated into the structure of the resin. At pH 3·5 methylene bridges form between the cycles and secondary nitrogen atoms; a considerable part of furfuryl alcohol reacts over the second α-carbon atom of the furane cycle. The crosslinked resin also has methylene bridges between the furane cycles and the tertiary nitrogen atoms of the urea residues.
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