Acceleration Mechanism with Tertiary Amines or Others for Epoxide Resin Cured with Aliphaticdicarboxylic Acids

Abstract

Bisphenol A type epoxide resins were cured with aliphatic α, ω-dicarboxylic acids in the absence or presence of an accelerator such as tertiary amines or stannous octanoate. Acceleration mechanism was studied by observing the tensile and tensile-shear strengths, variation of the remaining reactive groups, and the gel contents. In the presence of accelerator, the conversion of epoxide group and the changes of tensile and tensile-shear strength of cured resins were nearly the same as those in the absence of accelerator. However, the time of curing was decreased by addition of tertiary amines or stannous actanoate. From the results of saponification of cured resins and the changes of their reactive groups, it was found that the formation of ester linkages was selectively accelerated and that of ether linkages was inhibited by addition of tertiary amines. © 1980, The Society of Polymer Science, Japan. All rights reserved.