Flame-Retardant and Transparent Poly(methyl methacrylate) Composites Based on Phosphorus–Nitrogen Flame Retardants AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c01786

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In this article, dimethyl methylphosphonate (DMMP) and methacrylamide (MAM) were used as flame retardants to develop an efficient synergistic flame-retardant system of phosphorus and nitrogen, and P(MMA-co-MAM)/DMMP products were prepared by free-radical polymerization, which had an excellent flame-retardant effect and high transparency. When only 14 wt % DMMP/MAM is added, the limiting oxygen index (LOI) value of poly(methyl methacrylate) (PMMA) can reach 23.1%, and the vertical combustion grade can attain V-0. The flame-retardant pathways of the DMMP/MAM flame retardant mainly include terminating a free-radical chain reaction and gas phase dilution, which indicates that the gas-phase flame retardant plays an important role in the PMMA flame retardant. Meanwhile, the optical properties of P(MMA-co-MAM)/DMMP products are almost the same as those of pure PMMA. In addition, when 14 wt % DMMP/MAM is added, the mechanical properties of P(MMA-co-MAM)/DMMP products are only slightly changed, and the Vicat softening temperature is 65 °C higher than the long-term service temperature of commercial PMMA, which can fulfill the needs of most markets. This research provides a valuable method for preparing transparent flame-retardant PMMA products.