Thermal properties of amine cured diglycidyl ether of bisphenol A epoxy blended with poly(ether imide)

Thermal properties of an epoxy system containing diglycidyl ether of bisphe nol A (DGEBA) and 1,3-bisaminomethylcyclohexane (1,3-BAC) as curing agent m odified with poly(ether imide) (PEI) were studied using both dynamic mechan ical (DMA) and thermogravimetric (TG) analysis. The effect of thermal degra dation in air and in vacuum on the dynamic mechanical and thermogravimetric properties for the DGEBA/1,3-BAC/PEI system was investigated. The results showed that this system can be considered miscible for PEI contents up to 1 0 phr (phr: number of parts of PEI per hundred parts of the DGEBA epoxy res in), and also that even very small contents of PEI in the blends reduced th e thermal stability of the material. Thermal degradation during a short per iod of time of this material both, in air or in vacuum yields a decrease of thermal stability and an increase of the glass transition temperature with respect to the material without degradation. (C) 2000 Elsevier Science B.V . All rights reserved.