Keywords: 
• urea-formaldehyde resin /
• curing /
• thermal mechanical analysis (TMA) /
• differential scanning carlorimetry (DSC)

Abstract: Thermal mechanical analysis (TMA) is used in this paper to study the curing reaction of urea-formaldehyde (UF) resins. The relative information from TMA was examined by differential scanning carlorimetry (DSC) and laboratory-made particleboard. The effects of types and amount of hardener added on the curing of resin were discussed too. The results showed that TMA could be used to evaluate the beginning curing temperature, curing speed, mechanical performance and thermal resistance of resin system. These data from TMA were confirmed by the results of DSCand particleboard. It indicated that different hardener had different beginning temperature and curing speed; however, there were no obvious effects on both of them for UF resin when using more hardener. When too much hardener was used, pyrolysis of resin could happen and then the decreased mechanical performance was observed. UF resin with higher molar ratio F/U seems to be more sensitive to the amount of hardener added. 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