Syntheses of 4‐methacryloxy‐2,3,5,6‐tetrabromobenzyl phosphonates and effects of flame retardancy on their Co‐PMMA

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Abstract
4‐Methacryloxy‐2,3,5,6‐tetrabromobenzyl phosphonates (MTBBP) are prepared by the reaction of corresponding 4‐hydroxy‐2,3,5,6‐tetrabromobenzyl phosphonates (HTBBP) with methacryloyl chloride. Comparisons of flame retardancy among the copolymers of methylmethacrylate (MMA) with MTBBP or with 4‐methacryloxy‐2,3,5,6‐tetrabromotoluene(MTBT) and the mixture of poly(methyl methacrylate) (PMMA) with triphenyl phosphite reveal that the combination of phosphorus and bromine elements produces a synergistic effect on flame retardancy, and the chemical grafting of the fire‐resistant elements into the polymer backbone gives a better effect than the physical mixing of their compounds with polymer. The unsatisfactory results of homopolymers of the synthesized methacrylate monomers prepared by free radical polymerization in solution may be due to their less reactivities; however, they can readily copolymerize with a liquid vinyl monomer such as MMA by means of bulk polymerization.

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