Bio-based amine curing agents prepared from lignin by ring-opening functionalization with cyclic aza-silanes and their curing kinetics investigated for aliphatic and aromatic epoxy species

Bio-based epoxy curing agents from lignin was synthesized by ring-opening reactions of cyclic aza-silane species to obtain lignin-based with amine hydroxyl equivalent weights up 68 g/eq. Its cure kinetics investigated differential scanning calorimetry in which two representative aromatic and aliphatic were employed being diglycidyl ether bisphenol F (DGEBF) epoxidized soybean oil (ESBO). Utilizing Borchardt Daniels' method kinetic parameters, the activation energies, Ea, determined 101 ± 3 kJ/mol 71 7 pre-exponential factors, ln(Z), 27.6 0.9 s−1 13.3 1.7 respectively for DGEBF ESBO. The higher factor attributed π-π stacking interactions between components resulting overall faster aromatic-based species. agent retained antioxidative properties cured thermosets could act as an anti-corrosive agent. This enables preparation coatings without need leachable additive antioxidants.