Abstract: This paper analyzes different factors which may affect the alkali resistance of fully cured epoxy vinyl ester resins. The testing result shows that not only the density of ester group and the space protection function of its adjacent groups are the major factors of the alkali resistance, but also the crosslinking density and hygroscopicity of the molecular network structure play an important part for the alkali resistance.

Key words: epoxy vinyl ester resins, alkali resistance, crosslinking density, hygroscopicity