Curing kinetics study of epoxy resin/hyperbranched poly(amideamine)s system by non-isothermal and isothermal DSC

Abstract

Curing kinetics of epoxy resin/hyperbranched poly(amide amine)s (H-PAMAM) system was studied by non-isothermal and isothermal differential scanning calorimetry (DSC). Non-isothermal DSC scans indicated that H-PAMAM was an effective curing agent of epoxy resin. The apparent activation energy (E) was 54.3 kJ/mol calculated through Kissinger method, and the kinetic parameters were determined by Málek method for the kinetic analysis of the thermal treatment obtained by DSC measurement. A two-parameter (m, n) autocatalytic model (Sěsták-Berggren equation) was found to be the most adequate selected kinetic model. In addition, the predicted curves from the kinetic model fit well with the nonisothermal DSC thermogram. The isothermal DSC method was used to investigate the curing process for resin at 60, 65, 70, 75 and 80 °С, respectively. Isothermal kinetic parameters, including k 1 , k 2 , m and n, were determined based on an autocatalytic mechanism proposed by Kamal. Both models were validated for a fitting to the experimental data by the Levenberg-Marquardt method. A process to determine the initial values for the fitting procedure was also proposed. The predictions of the validated models were in good agreement with the measured data, and were therefore applicable for numerical process optimization.

Research on curing kinetics of multiaxial warp‐knitted composites

“…The research of curing process should be done with respect to the curing kinetic model of cross-linking reaction. [11][12][13] Zhang et al 14 obtained the curing process of the epoxy resin (TSPZ-EP) with the structure of silicon and dissonance by using the curing kinetic model of the epoxy resin. Facundo et al 15 studied the curing process of epoxy on the basis of curing kinetics and provided a theoretical basis for optimizing curing process.…”

Amidoamine: Synthesis, disparity in cure with epoxy resins between bulk and solvent systems, and structure–property relationships of its epoxy‐based coatings

“…However, the reaction between NH of ‐(C = O)NH moieties and epoxy groups at ambient or elevated temperatures has hardly been studied. Cure kinetic study of epoxy–amidoamine systems via differential scanning calorimetry (DSC) only dispenses the overall extent of reaction without differentiating between the individual component reactions . The evaluation of epoxy–amidoamine reactions via mid‐IR (600–4,000 cm −1 ) spectroscopy has been compromised by the fact that epoxy resins and amidoamines exhibit overlapping bands in the mid‐IR region.…”