Abstract
A halogen-free, flame-retardant polystyrene containing polyphenylene ether (PPE) with excellent melt flow, impact resistance, and heat resistance can be obtained through concurrent use of hydroxyphenyl-containing phosphate (resorcinyl diphenyl phosphate: triphenyl phosphate (TPP)-OH) as phosphorus-containing flame retardant and melamine cyanurate (MC) as nitrogen-containing flame retardant. Investigation of interactions between these two flame retardants showed that an intumescent process, which involves the formation of char that swells and foams, occurs upon the burning of this resin composition and lowers the burning surface temperature by 130°C compared with the resin composition without MC, in which the intumescent process does not occur. The resin composition containing TPP-OH/MC has higher impact resistance than that containing TPP/MC (TPP: contains no hydroxyl group). Viscoelastic measurement indicated significant interactions between TPP-OH and MC, including particularly hydrogen bonding between their hydroxyl and amino groups, which suggests that TPP-OH acts as a compatibilizer of MC.
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Nishihara, H., Tanji, S. & Kanatani, R. Interactions between Phosphorus- and Nitrogen-Containing Flame Retardants. Polym J 30, 163–167 (1998). https://doi.org/10.1295/polymj.30.163
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DOI: https://doi.org/10.1295/polymj.30.163
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