Combined Fire Retardant Action of Phosphonated Structures and Clay Dispersion in Epoxy Resin

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In this work epoxy-clay nanocomposites were synthesized by in situ polymerization of a prepolymer (diglycidyl ether of bisphenol-A) [DGEBA] crosslinked with methyl tetrahydrophthalic anhydride [MTHA] filled with organicallymodified and natural montmorillonites. The morphology of epoxy-montmorillonite composites was assessed by X-ray diffraction and transmission electron microscopy. A phosphorus containing fire retardant monomer, 2,2-Bis (3-diethyloxyphosphonyl-4-hydroxyphenyl) propane [BisP] or 5,5'-Bis (diethyloxyphosphonyl)-6,6'-dihydroxy-3,3,3',3'-tetramethyl-l,l'-spirobiindane [SpiroP], was copolymerized with DGEBA to prepare a halogen free fire retardant polymer/layered silicate nanocomposite suitable for electrical and electronic applications. Thermogravimetry shows that in nanocomposites the epoxy matrix chars in nitrogen as in air, independent of the presence of the phosphorus-containing comonomer, whereas the pure epoxy matrix chars only in air. The rate of heat release in the nanocomposite combustion is strongly reduced as compared to the pure epoxy resin. An additive or synergistic fire retardant effect is found in nanocomposites prepared by copolymerization of the phosphorus containing fire retardant materials.

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