Abstract
AbstractA main‐chain phosphorus‐containing diepoxide, bis‐glycidyloxy phenylphosphate (BGPP), was synthesized, then blended with various contents of a 4,4′‐diglycidylether of bisphenol A (DGEBA)‐type epoxy resin, DER 331. The curing reactions of the blended resins with diethyltriamine (DETA) and the thermal properties of the cured specimens were investigated with an infrared spectrophotometer, a differential scanning calorimeter, and a thermogravimetry analyzer. The activation energy is 51.2 kJ/mol for the BGPP–DETA curing system, and it increases with the content of DER 331 for the BGPP–DER 331–DETA systems. The average apparent decomposition activation energies of the thermosets with phosphorus‐containing epoxide are from 147.3 to 165.1 kJ/mol, which are higher than that of the DER 331–DETA system (95.8 kJ/mol). The BGPP–DETA system shows a relatively higher char yield and limiting oxygen index (LOI) value, 29–31, but the thermoset with BGPP results in a decrease in the Tg. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2733–2740, 2002; DOI 10.1002/app.10160
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