Synthesis, Characterization and Glass Reinforcement of Dimethylolurea-3-AminoPhenol-Epoxy Resin Curing Systems

Abstract

N,N′-Dimethylolurea (DMU) was prepared and condensed with 3-aminophenol (AP) in the presence of alcoholic alkali catalyst at varying mole ratios of DMU: AP. The resultant dimethylolurea-3-aminophenol (DMUAP) resins were characterized. DMUAP-epoxy curing systems have been prepared by mixing DMUAP and epoxy resin (DGEBA) in different proportions. The curing study of DMUAP-epoxy systems was monitored on DSC and kinetic parameters were evaluated. Based on DSC data, glass-reinforced composites of DMUAP-epoxy systems have been laminated and characterized. The unreinforced cured material of DMUAP-epoxy systems were analyzed by thermogravimetric analysis (TGA).

Keywords:

• 3-Aminophenol (AP)
• 4,4′-Diaminodiphenyl methane (DDM)
• Differential Scanning Calorimeter (DSC)
• Epoxy resin (DGEBA)
• Hexamethylenetetramine (HMTA)
• Infrared spectra (IR)
• N,N′-dimethylolurea (DMU)
• N,N′-dimethylolurea-3-aminophenol (DMUAP) resin
• Thermogravimetric analysis (TGA)

ACKNOWLEDGMENT

We are thankful to Head of the Chemistry Department for providing research facilities.

Notes

*Efflux viscosity time measured by using flow cup type “B” 5 (BS 1733) (at 30°C).

**DP = Degree of polymerization.

^a Chemical resistance to alkali (25% W/V NaOH); composite are unaffected by organic solvents such as acetone, concentrated mineral acid such as sulphuric acid, nitric acid, hydrochloric acid, etc. (25% V/V).