Abstract
In curing the bisphenol type epoxide resin, the ether type, amine type, and mixed type network structures were formed by using tertiary amine as curing catalyst and by aliphatic diamine in the presence or absence of salicylic acid as an accelerator, respectively.
Internal stress of these systems were followed by observing the strain of the steel rings embeded in the cured resins.
The stress was caused by the shrinkage occured in the cooling process from the glass transition temperature to room temperature.
The internal stress, shrinkage and glass transition temperature of the cured systems decreased with a decrease in the concentration of network chains and with an increase in the methylene linkages of amine curing agents. It appears that the reduction in the concentration of network chains were necessary to reduce the internal stress and shrinkage caused by the curing.
