Epoxy–amine oligmer production

Abstract The production of an adduct epoxy‐polytheramine with free epoxy groups is anlyzed. Diffrential scanning caloriemetry (DSC), infrared spectroscopy (IR), titration of functional groups, and gel permeation chromatography (GPC) were used to study the reaction of bisphenol A diglycidyl ether (DER 332) with an aliphatic hindered polyether‐amine (Jeffamine D‐2000). The general kinetic model derieved by Riccardi and Williams 1 is extended to generate equations for nonstoichiometric epoxy‐amine systems. The parameter N , which gives the reactivity ratio between the secondary and primary amine groups, was obtained from a linear regression obtained at various temperature levels. the activation energies of the epoxy amine reaction catalyzed by OH groups and the noncatalytic one were determined. According to experimental evidence, the etherfication reaction may be neglected. From dynamic experiments in DSC a heat of reaction of 25 kcal/eq was obtained. The weight average molecular weight of different epoxy‐amine oligomers with high ratio of epoxy‐amine were compared with those theoretically predicted using an statistical structural model (SSM). This model utilizes a kinetic scheme and a recursive method to determine statistical parameters and it was applie before to phenolic resins 2,3 epoxy‐amine systems. 4 Depending on the required ologomer characteristics, the best production policy can be established using he data supplied in this report.