Abstract
A phosphorus-containing oligomer, bis(3-hydroxyphenyl) phenyl phosphate (BHPP), was synthesized through the reaction of phenyl dichlorophosphate and 1,3-dihydroxybenzene, and characterized by elemental analysis, Fourier transform infrared (FTIR), 'H-NMR, and 3 1 P-NMR spectroscopy. Subsequently, phosphate-based epoxy resins, with phosphorus contents of 1 and 2 wt %, were prepared via the reaction of diglycidyl ether of bisphenol-A, BHPP and bisphenol-A, and were characterized by FTIR and gel permeation chromatography. Phenolic melamine, novolac, and dicyanodiamide were used as curing agents to prepare the thermoset resins with the control and the phosphate-based epoxy resins. Thermal analysis investigations revealed that the thermoset resins cured with phenolic melamine exhibited higher glass-transition temperatures than the others, owing to the high rigidity of their molecular chain. Thermogravimetric analysis demonstrated that the decomposition temperatures of the thermoset resins cured with novolac were higher than those of the others. A synergistic flame retardant effect from the combination of the phosphate-based epoxy resin and the nitrogen-containing curing agent has been observed.
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