Abstract
The curing process and cured structures of bismaleimide (BMI) /epoxy resin (EP) blends have been studied by solid-state CP/MAS (Cross Polarization/Magic Angle Spinning) 13C-NMR spectroscopy, dynamic viscoelastic measurements and DSC.
In the curing reaction of BMI/DDM/EP system, in which diaminodiphenylmethane (DDM) acts as a hardener, the addition reaction of amino groups to epoxy groups occurred mainly at 170°C, followed by the polymerization of maleimide by post curing at 250°C. In this sample was observed the good miscibility of maleimide resin with epoxy resin.
In the curing reaction of BMI/EP/2MZ system in which 2-methylimidazole (2MZ) acts as a hardener, the polymerization of maleimide rapidly proceeded at 170°C and the polymerization of epoxy groups occurred by post curing at 250°C. There was observed poor miscibility in this sample.
