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Study of the structural changes in urea‐formaldehyde condensates during synthesis
Author(s) -
Siimer Kadri,
Pehk Tõnis,
Christjanson Peep
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991480113
Subject(s) - urea formaldehyde , formaldehyde , urea , methylene , ether , chemistry , polymer chemistry , organic chemistry , adhesive , layer (electronics)
Chemical constitution of urea‐formaldehyde resins in synthesis and in storage was determined using 13 C 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.