Thermal behavior of modified urea-formaldehyde resins
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The thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resins with hexamethylenetetramine-HMTA (Resin 1), melamine-M (Resin 2), and ethylene urea (EU, Resin 3) including nano-SiO2 was investigated by non-isothermal thermo-gravimetric analysis (TG), differential thermal gravimetry (DTG), and differential thermal analysis (DTA) supported by data from IR spectroscopy. Possibility of combining inorganic filler in a form of silicon dioxide with UF resins was found investigated and percentage of free formaldehyde was determined. The shift of DTG peaks to a high temperature indicates the increase of thermal stability of modified UF resin with EU (Resin 3) which is confirmed by data obtained from the FTIR study. The minimum percentage (6%) of free formaldehyde was obtained in Resin 3.
Keywords:Urea / Formaldehyde / Melamine / Hexamethylenetetramine / Ethylene urea / Silicon dioxide / TG-DTG / DTA analysis
Source:Journal of Thermal Analysis and Calorimetry, 2011, 104, 3, 1159-1166
- Ministry of Science of the Republic of Serbia
- 20th CTAS Annual Workshop and Exhibition CTAS, May 12-13, 2010, Mississauga, Canada