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    Phosphorylated Salicylic Acid as Flame Retardant in Epoxy Resins and Composites

    Lara Greiner1,*, Philipp Kukla2, Sebastian Eibl1, Manfred Döring3

    Journal of Renewable Materials, Vol.10, No.7, pp. 1931-1950, 2022, DOI:10.32604/jrm.2022.019548

    Abstract A novel, versatile flame retardant substructure based on phosphorylated salicylic acid (SCP) is described and used in the synthesis of new flame retardants for HexFlow® RTM6, a high-performance epoxy resin used in resin transfer molding processes as composite matrix. The starting material salicylic acid can be obtained from natural sources. SCP as reactive phosphorus chloride is converted with a novolak, a novolak containing 9, 10-dihydro-9- oxa-10-phospha-phenanthrene-10-oxide (DOPO) substituents or DOPO-hydroquinone to flame retardants with sufficient thermal stability and high char yield. Additionally, these flame retardants are soluble in the resin as well as react into the epoxy network. The determined… More >

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