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- W4293431718 abstract "Purpose This paper aims to study a new halogen-free fame-retardant curing agent 1-aminoethylidenediphosphonate (AAEDP). Design/methodology/approach The AAEDP was synthesized by phosphoric acid, acetonitrile and ammonia. The chemical structures of AAEDP were characterized by proton nuclear magnetic resonance, mass spectrometry and Fourier transform infrared spectrometer. Thermal gravimetric analysis (TGA) and scanning electron microscope (SEM) would study the thermal properties and the char residues of AAEDP/EP. The thermal stability, mechanical and flame properties and morphology for the char layer of composite materials were separately investigated using TGA, tensile and charpy impact tests, limiting oxygen index (LOI), UL-94 HB flammability standard (UL-94) and SEM. Findings The results showed that the AAEDP had been prepared successfully. When the intumescent flame retardant was added into the EP, the LOI of composite material was improved. Research limitations/implications The AAEDP can be prepared successfully and can improve the flame resistance of composite material. Practical implications The AAEDP has excellent flame-retardant properties and produce no toxic fumes when burnt in case of fire. Originality/value The results showed that the phosphorus content of AAEDP was 2.958 Wt.%; the impact and tensile strength of the composite material were 6.417 kJ m −2 and 38.0 MPa, respectively; and the LOI and UL-94 were 29.7% and V-0 ranking, respectively. The TGA results indicated that the carbon residue ratio can be increased by 1000°C in air. The denser and more uniform structure of residual carbon prevents heat transfer and diffusion, restricts the production of combustible gas and reduces the rate of heat release." @default.
- W4293431718 created "2022-08-29" @default.
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- W4293431718 date "2022-08-30" @default.
- W4293431718 modified "2023-09-26" @default.
- W4293431718 title "Synthesis and properties of a new halogen-free flame-retardant epoxy resin flame retardant" @default.
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- W4293431718 doi "https://doi.org/10.1108/prt-01-2022-0009" @default.
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