Journal of Materials and Engineering Structures
Volume 13, Numéro 2, Pages 217-224
2026-06-30
Thermal Characterization Of Stoichiometrically Varied Epoxy Networks Under Elevated Heating Rates Via Differential Scanning Calorimetry
Authors : Ganesan S . Chandaka Sravanth . Sathwik Akkewar . Mukesh Durgapu .
Abstract
This study presents a differential scanning calorimetry (DSC) investigation of epoxy thermosets formulated with varying stoichiometric resin-to-hardener ratios (1:1, 2:1, and 3:1) subjected to non-isothermal heating conditions. The influence of high heating rates of 15 oC/min for the epoxy-hardener ratio 1:1, 2:1 and 3:1 on the thermal transitions, residual cure behavior, and thermal stability was analyzed. The results demonstrate that deviations from stoichiometric balance significantly alter the thermal response of the cured networks. The 1:1 system exhibited a more uniform and complete cure with higher thermal stability, while excess amine 2:1 and excess epoxy 3:1 formulation exhibited prominent post-curing exotherms and thermodynamic instability. The glass transition occurred between 54.36 oC and 53.65oC for the ratios 2:1 and 3:1. The 1:1 ratio, among the tested stoichiometries, approximates this behavior under the applied high heating rate. Both 2:1 and 3:1 ratio demonstrated deficiencies in thermal parameters, confirming their suboptimal thermal and structural performance due to stoichiometric imbalance.
Keywords
Epoxy ; Differential Scanning Calorimetry ; High Heating Rate ; Thermal Stability
Les articles similaires
Redaoui Djaida
.
Sahnoune Foudil
.
pages 7-12.
Chahraoui Yamina
.
pages 35-44.
Elong Ouissam
.
Senoussaoui Abderrahmane
.
pages 17-21.
Ghazy Mariam F.
.
Abd Elaty Metwally A.
.
Taman Mohamed
.
Mehriz Alaa M.
.
pages 423-447.
Belal T.
.
Medjadi D.
.
Abdelali M.
.
Zair R.
.
pages 579-582.
