蓖麻油基固化剂的制备及其对环氧树脂的增韧改性OACHSSCD

Two novel amide-type curing agents-maleated castor oil triethylenetetramine(MCOT)and maleated castor oil-diethylenetriamine(MCOD)——were synthesized from biomass-derived castor oil by introducing carboxyl groups and reacting with triethylenetetramine(TETA)and diethylenetriamine(DETA)via amidation.The influence of these castor oil-modified curing agents on the toughness of epoxy resin was investigated.The chemical structures of the products were confirmed by Fourier-transform infrared spectroscopy(FT-IR)and proton nuclear magnetic resonance(1H NMR).Both MCOT and MCOD were then used to cure bisphenol-A epoxy resin,and the properties of the cured resins were evaluated.Results indicated that the epoxy resins cured with MCOT and MCOD exhibited elongations at break of 21.64％and 32.22％,respectively,with corresponding toughness values of 45.5 MJ/m3 and 29.0 MJ/m3.SEM analysis revealed that the fracture surface of the MCOT-cured material exhibited typical ductile fracture features.Its thermal stability was superior to that of MCOD,achieving a maximum decomposition temperature of 488.7 ℃ and a char yield of 9.8％.This research offers novel insights for applying renewable resources in epoxy curing agents,and the synthesized curing agents demonstrate promising potential in flexible composite materials.