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The curing behavior of diglycidyl-4, 5-epoxycyclohexane-1, 2-dicarboxylate with m-phenylenediamine has been studied by using torsional braid analysis. It is shown that the whole curing processproceeds in two stages, that is, curing reaction at temperatures below 100℃mainly occurs at the ali-phatic epoxy rings, whereas a rapid increase in reaction rate of the remaining cycloaliphatic epoxy ringoccurs only at temperatures above 130℃. Between the temperature range from 100℃to 130℃, the“full reaction” of the aliphatic epoxy rings is approximated, while the reaction rate of the cycloaliphaticepoxy ring begins to increase gradually. The maximum glass transition temperature (T_(g∞)) of the systemdoes not emerge before 220℃. The apparent activation energy is 13 .2 kcal/mole.
The curing behavior of diglycidyl-4, 5-epoxycyclohexane-1, 2-dicarboxylate with m-phenylenediamine has been studied by using torsional braid analysis. It is shown that the whole curing process proceedings in two stages, that is, curing reaction at an below 100 ° C mainly occurs at the ali-phatic epoxy rings, a rapid increase in reaction rate of the remaining cycloaliphatic epoxy ringoccurs only at temperatures above 130 ° C. Between the temperature range from 100 ° C to 130 ° C, the “full reaction” the maximum glass transition temperature (T_ (g∞)) of the system do not emerge before 220 ° C. The apparent activation energy is 13 .2 kcal / mole.