Abstract:
Epoxy resins were synthesized through the cure agents of hydrazide and acylhydrazone derived from fatty dimer acid. The curing behavior, structure and properties of the cured epoxy resins were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, scanning electron microscope, thermogravimetric analysis and dynamic mechanical analysis. The unique properties of the imine dynamic covalent bond of the network material were studied. The modified epoxy resins show improved toughness. Besides, the glass transition temperature (
Tg) and thermal stability don't reduce dramatically compared to traditional epoxy resin. When the cured epoxy resin is treated at elevated temperature or enough pressure, the acid can catalyze dynamic imine exchange reaction and make the material smart response for temperature and pH.