Abstract
The addition reaction of γ-butyrolactone with epoxy resin was carried out in CCl4 solution, with BF3:MEA added as a catalyst. The trioxaspiro-ortho-estering structure of prepolymer was obtained first. The ring structure was opened to form a crosslinked structure of polymer at higher temperature. The structures of prepolymer and polymer have been indentified by the infrared spectra. The thermal stability of polymer was evaluated by thermo-gravimetric analysis. It was found that the glassy temperature of the polymer increased, and that the thermal stability of the polymer in the early stage decreased with an increase in the amount of BF3: MEA catalyst added. Moreover, the mechanical properties of a laminate made of γ-butyrolactone-modified epoxy resin with glass fiber cloth have been measured. The results indicated that the break energy decreased and the flexibility increased with an increase in the content of the modified resin in the laminate.
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