TG-DTA study of melamine-urea-formaldehyde resins

The thermal behaviour of WIF resins from different suppliers with different content of melamine was studied, along with the C-13 NMR spectroscopic analysis of resin structure and the testing of particleboards in current production at Estonian PB factory Parnu Plaaditehas AS. The chemical structure of resins from DMSO-d(6) solutions was analysed by C-13 NMR spectroscopy on a Bruker AMX500 NMR spectrometer. The melamine level in different MUF resins is compared by the ratios of carbonyl carbon of urea and triazine carbon of melamine in C-13 NMR spectra. Curing behaviour of MUF resins was studied by simultaneous TG-DTA techniques on the Labsys (TM) instrument Setaram. The shape of DTA curves characterisises the resin synthesis procedure by the extent of polymerisation of UF and MF components and is in accordance with structural data.