Are cured epoxy resins inhomogeneous?

摘要: Abstract The alternating mechanism of network formation in the curing epoxy resins from bisphenol A diglycidyl ether (BADGE) and amine agents does not offer any special opportunity for inhomogeneities caused by partial segregation or inhomogeneous crosslinking. Etched fracture surfaces cured with 4,4′-diaminodiphenylmethane, hexamethylenediamine hexahydrophthalic anhydride at various initial ratios BADGE, studied electron microscopy, reveal globular structures 20–40 nm size. However, similar are observed etched amorphous polystyrene poly(methyl methacrylate). small-angle X-ray scattering curves do differ principle those common polymers; swelling a solvent lower density lead to an increase within particle size range 10–10 2 nm. It is pointed out that physical structure simple essentially polymers. With more complicated systems, pronounced inhomogeneity might be thermodynamic incompatibility non-alternating mechanisms reaction.