| Abstract: | The modification of epoxy resins by means of carbon dioxide is presented. The resulting resins contained different amounts of cyclic carbonates (1,3-dioxolane-2-one rings) instead of a part of epoxy groups. The effect of the cyclic carbonate content on viscosity, gel time, peak exotherms, and crosslinking extent of the above mentioned resins was investigated. Mechanical and thermomechanical properties of the modified resins cured with triethylenetetramine have been determined. It was found that heat-distortion temperature, impact resistance, hardness, compressive strength, and lap shear strength of the resins containing cyclic carbonates were higher than those of unmodified ones. |
