Original
Curing Behavior of Epoxy Resins with1,8-diazabicyclo[5.4.0]-7-undecene (DBU) Derivatives
2019 Volume 40 Issue 2 Pages 63-69
Details
2019 Volume 40 Issue 2 Pages 63-69
In this paper, we report synthesis of DBU derivatives bearing various alkyl substituent (Alkyl DBU)s at 6-position and their catalytic effect in the thermal curing of bisphenol A diglycidyl ether (DGEBA). In the case of DBU, the curing process showed small exothermic peaks at 55 ºC and at 100 ºC. In contrast, in the case of Alkyl DBUs, the curing process exhibited their first exothermic peaks at 125 ºC, and second peaks at 200 ºC. All the cured epoxy resin prepared by DBU derivatives were insoluble, transparent, and hard solids. Compared to the epoxy resin cured by DBU, the resins cured by the alkylated DBUs showed higher gel fraction, volume shrinkage, and heat resistance. Therefore, Alkyl DBUs are expected to be useful compounds as thermally latent and highly active curing agents for epoxy resins.
