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K. Starzyńska, J. Mazur, H. Otwinowska, A. Krystosik

Amino resins used in the production of wood-derived materials. Part I. Investigations on the chemical mechanism

of condensation and structure of melamine-formaldehyde resins

Polimery 1992, No 1, 25

DOI: dx.doi.org/10.14314/polimery.1992.025


Several analytical methods were used for the determination of the chemical mechanism of condensation of melamine with formaldehyde at molar ratio of melamine to formaldehyde in the range of 1 : 2.4 to 3.0. The effect of time of condensation and pH-value of the reaction medium was investigated. The content of methylol groups, dimethyleneether bridges and free formaldehyde was determined. To determine the chemical structure of melamine-formaldehyde resins prepared under selected conditions of condensation and at a molar ratio of formaldehyde to melamine 1 : 3.0 13C-NMR spectra and mass spectroscopy spectra were determined and evaluated. Molecular weights and molecular weight distribution of the resins were determined by the GPC-method. The results of these investigations were applied in the development of a liquid adhesive composition for the manufacture of water-resistant plywood and chipboard.

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