Flame Retardant Epoxy Resins Based on Diglycidyl Ether of (2,5-Dihydroxyphenyl) Phosphine Oxide

M. SPONTÓN; J. C. RONDA; M. GALIÀ; V. CÁDIZ

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

Wiley InterScience

Año: 2007 vol. 45 p. 2142 - 2151

0887-624X

Phosphine oxide-containing epoxy resins were prepared from diglycidyl ether of(2,5-dihydroxyphenyl)diphenyl phosphine oxide and diglycidyl ether of bisphenol A by crosslinking with 4,4-diaminodiphenylmethane. Several(2,5-dihydroxyphenyl)diphenyl phosphine oxide / diglycidyl ether of bisphenol A molar ratios were used to obtain materials with different phosphorus content. The properties of the thermosetting materials were evaluated by differential scanning calorimetry, dynamic mechanical analysis, thermogravimetric analysis, and limiting oxygen index and related to the phosphorus content. Thermal and thermooxidative degradation was studied by GC/MS, NMR spectroscopy, and scanning electron microscopy. Limiting oxygen index values indicate good flame retardant properties that are related to the formation of a protective phosphorus-rich layer that slowed down the degradation and prevented it from being total.