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A method of obtaining modified amine curing agents containing β‐hydroxyurethane linkages is presented. The basic physical and chemical properties of the modified polyamines, such as viscosity and reactivity towards epoxy resins, have been studied. A shortening of the gel and curing times in addition to a decrease of the exothermic effect accompanying the curing of an epoxy resin was found in comparison with the system containing an unmodified amine. Mechanical and thermomechanical studies showed a rise of the deflection temperature, hardness and strength features such as tensile strength, shear and peel strength for epoxy resins crosslinked with modified curing agents in comparison with those parameters obtained for resins crosslinked with the initial amines.
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Rokicki et al. (1989) studied this question.
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