Ammonium salts of pre-gelled epoxy networks, in the form of spherical clusters, were prepared by the addition of hydrogen chloride in methanol solution to partially cured bisphenol A diglycidyl ether/ethylene diamine epoxy resins. The formation of ammonium salts resulted from the interaction of hydrogen chloride with the amine groups of the pre-gelled epoxy networks, as indicated by their infra-red and solid-state 13C n.m.r, spectra and X-ray diffraction patterns. By increasing the time allowed for branching reactions or by increasing the concentration of branched molecular chains, the spherical clusters tended to form as agglomerations of ribbon textures, which were then demonstrated to be associated with the packing of the branched molecular chains. The packed networks could also be detected through X-ray diffraction studies of the post-gelled epoxy resins.
Посилання на статтю:
A study of the structure of pre-gelled epoxy networks / King-Fu Lin* and Wen-Yung Shu // Polymer. – 1994. – Vol 35. – P. 3535-3541.