Flammability and mechanical properties of a new fire resistant epoxy

摘要

The flammability, thermomechanical properties, and fire response of the diglycidylether of 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene (DGEBC) cured with several hardeners were examined and compared to diglicidylether of bisphenol-A (DGEBA) systems. The DGEBC and DGEBA were cured with: 1) triethylenetetramine, 2) methylenedianiline, 3) the parent phenol (BPC or BPA), 4) catalytic amounts of (2-ethyl-4-methylimidazole) (EMI-24), and, 5) the dicyanate of bisphenol-C. Cured samples were measured for strength, modulus, flame resistance (LOI, UL-94 V), flaming heat release rate, and heat release capacity. The mechanical properties of the DGEBC and DGEBA systems were equivalent but the DGEBC systems exhibited superior flame resistance and 50% lower heat release rate and heat release capacity than the corresponding DGEBA system. The DGEBC cured with methylenedianiline had a limiting oxygen index (LOI) of 30-31, exhibited UL 94 V-0/5 V behavior and easily passed the FAA heat release requirement FAR 25.853(a-1) as a single-ply glass fabric lamina.