Chemical constitution of urea‐formaldehyde resins in synthesis and in storage was determined using 13C NMR spectroscopy. Methylolation, methylene and dimethylene ether bond‐forming reactions were discussed. The changes in the content of structural elements with secondary and tertiary amino groups of urea at various stages were followed. The resin synthesis technology was used, which considers the requirement in low free formaldehyde content, connected with somewhat smaller storage stability of resins.
No takes yet. Share an insight, caveat, or question.
Siimer et al. (1999) studied this question.