Cure kinetics, morphology and miscibility of modified DGEBA-based epoxy resin – Effects of a liquid rubber inclusion

Preparation and properties of bio-based epoxy networks derived from isosorbide diglycidyl ether

Near- and mid-infrared spectroscopy studies of an epoxy reactive system

Polymer networks derived from curing of epoxidised linseed oil: influence of different catalysts and anhydride hardeners

Functionalized green tea tannins as phenolic prepolymers for bio-based epoxy resins

Differential Scanning Calorimetry (DSC) is used to study the curing behavior of epoxy systems. For non-catalyzed diamine-epoxy systems, the reaction enthalpy ΔH and the glass transition temperature Tg are evaluated and related to the structure of the hardener. A method is developed to determine the activation energy. The effect of variations in the amine-to-epoxy ratio r on Tg is also examined. A maximum value is observed for r = 1. Then, the influence of benzyldimethylamine as catalyst in an anhydride/DGEBA system and in three diamine/DGEBA systems is reported. In the cases of DDS and DDA curing agent the maximum value of Tg is shifted, to r = 0, 6. The results are explained by different reaction mechanisms.

Abed Sabra

Papers

Characterization of epoxy thermosetting systems by differential scanning calorimetry