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K. Starzyńska


Studies of the chemical reaction of urea with formaldehyde and furfuryl alcohol


Polimery 1982, No 12, 474



DOI: dx.doi.org/10.14314/polimery.1982.474

Summary

The changes in composition of the urea-formaldehyde-furfuryl alcohol resins during the condensation reaction have been studied analytically. The sulfite, iodometric, bro- mometric and Zeissel method have been used. It has been found that the content of free formaldehyde, hydroxyme- thyl groups and intermolecular bonds after the period of precondensation depends on the pH value and amount of furfuryl alcohol In the reaction medium. For resins prepa­red by the acid condensation si miliar relationships have been observed to those for resins without furfuryl alcohol, the amount of free formaldehyde decreasing with the in­crease in furfuryl alcohol ratio. The relation between the degree of condensation of resins and amount of furfuryl alcohol on the one side and the content of hydroxymethyl groups and intermolecular bonds on the other side has been established. The above mentioned relationships have been confirmed by chromatographic studies.


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