On the curing reaction of an epoxy resin based on mesogenic naphthalene derivative

The curing reaction of diglycidyl ether of 2,7-dihydroxynaphthalene (2,7-DGEDHN), epoxy mesogenic monomer, in the presence of the curing agents, namely, 4,4'-methylene-bis(3-chloro-2,6-diethylaniline) (MCDEA), 2,7-diaminofluorene (DAF) or 2-aminobiphenyl (2-ABP), was studied using differential scanning calorimetry (DSC), optical microscopy under crossed polarizers and wide angle X-ray scattering (WAXS) techniques. The curing reaction of 2,7-DGEDHN/MCDEA mixture led to a product without liquid crystalline properties. The product obtained by the curing reaction of 2,7-DGEDHN/DAF mixture is characterized by a texture of smectic-like structure of Schlieren type. The curing reaction of 2,7-DGEDHN/2-ABP mixture led to an isotrope non-crosslinked product.