چكيده لاتين :
An investigation is conducted into the non-isothermal kinetics of the curing reaction
of diglycidyl ether of bisphenol A (OGEBA) epoxy resin with two novel aromatic
diamines, 4,4י-diaminostilbene (OAS) and 4,4י-diaminoazobenzene (OMB), as curing agents. Kinetics analysis of the curing reaction of OGEBA with two different concentrations (29 wt% =0.13 mol% and 19 wt%=0.09 mol%) of the curing agents was studied using non-isothermal differential scanning calorimetry (OSC) technique.
Two methods (Ozawa and Kissinger) for analysis of the scanning OSC data were applied to calculate the kinetic parameters and compared with kinetic parameters
obtained from isothermal OSC tests using Kamal method. Activation energies in the range of 52.5-59.5 kJ/mol were obtained for both OGEBA/curing agent systems. The water absorption and resistance of the cured products against solutions of H2S04 and NaOH were also studied. Water uptake curves for both systems are similar. Weight loss for the cured products of OGEBA/OAS and OGEBA/OMB systems in 50% solution of NaOH reached the equilibrium values of 0.2% and 0.5%, respectively
after about 80 h and weight gain of the cured products of both systems in 30% solution
of sulphuric acid reached the equilibrium value of about 0.3% after about 40 h. The cured products from OGEBA/OAS system showed less weight loss during thermal degradation at 250°C but their water uptake was much higher.
