Curing of Diglycidyl Ether of Bisphenol P with Nitro Derivatives of Amine Compounds, 2

Summary: Differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis and polarized light microscopy were used to study the curing reaction of diglycidyl ether of 4, 4′‐bisphenol P epoxy resin with an aromatic amine, 3‐nitro‐1,2‐phenylenediamine. Because of different reactivity of the two amino groups, the curing gives rise to two processes represented by two peaks on a DSC curve. It is demonstrated that the amine group in position 1 is more reactive than the one in position 2. Kinetic analysis was performed by using an advanced isoconversional method, which suggests that the effective activation energy for the first process is around 50 kJ · mol−1, and for the second process, is about 100 kJ · mol−1. Dependence of activation energy on the extent of conversion (points) and the dependence of the extent of conversion on temperature (line) at the heating rate of 10 °C · min−1 for DGEBP/3‐NPDA system. Stars correspond to the stoichiometric system, open circles and squares represent respectively the 1st and 2nd peak for the system with an excess of amine. image Dependence of activation energy on the extent of conversion (points) and the dependence of the extent of conversion on temperature (line) at the heating rate of 10 °C · min−1 for DGEBP/3‐NPDA system. Stars correspond to the stoichiometric system, open circles and squares represent respectively the 1st and 2nd peak for the system with an excess of amine.