Curing of Epoxy Resin with Phosphorylated Diamine

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Abstract
The diglycidyl ether of Bisphenol-A (DGEBA), suitable for the manufacture of epoxy-glass fiber laminates, has been cured with bis(m-aminophenyl)methylphosphine oxide (BAPO), and the results have been compared with a commercially available 4,4′-diaminodiphenyl sulfone (DDS). DSC studies indicated that an increase in the concentration of diamine resulted in an increase in the extent of the curing reaction even above the optimum level of diamine. Cured resins were stable up to 300°C and started losing weight above this temperature. Glass fabric-reinforced laminates based on DGEBA:BAPO exhibited a higher limiting oxygen index (LOI), as well as higher shear and flexural strength than those based on the DGEBA:DDS system. Thermal aging at 185°C for 100 h did not affect the mechanical properties of laminates. However, a significant decrease was observed in interlaminar shear strength by boiling in water for 100 and 200 h.