One-pot In Situ Synthesis of Hollow Layered Double Hydroxide–Ammonium Polyphosphate Nanoshells toward Flame Retardant

Abstract

A novel approach to synthesize nanostructure composites of layered double hydroxide–ammonium polyphosphate (LDH–APP) is reported. hollow LDH–APP nanoshells were synthesized by simply mixing precursor solutions and systematically characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Brunauer–Emmett–Teller (BET) techniques. The as-fabricated LDH–APP–PP (polypropylene) composites using hollow LDH–APP nanoshells as nanofiller show excellent flame-retardant performance, which is much better than that of LDH–PP. It is expected that such a kind of LDH–APP composite materials may have potential applications in the field of industrial flame-retardant.

Ammonium Polyphosphate Intercalated Layered Double Hydroxide and Zinc Borate as Highly Efficient Flame Retardant Nanofillers for Polypropylene

“…Nevertheless, Bragg reflections with low intensity were observed in Mg 3 Al-APP LDH. This is perhaps because the APP-LDH become more amorphous, and thus there is insufficient coherence along the platelet stacking axis ( c -axis) to observe any high intensity (00 l ) Bragg reflection [29].…”

“…The band at 1365 cm −1 is attributed to the interlayer of CO3 2− . Besides, the bands at 1141, 907, and 1440 cm −1 are attributed to the vibrations of P–O and N–H group, respectively, demonstrating the presence of phosphate in the obtained APP-LDH nanoparticles [29]. The spectra results suggest a successful intercalation of APP molecules into the interlayers of LDH and that they were not decomposed.…”

Ammonium Polyphosphate Intercalated Yttrium-Doped Layered Double Hydroxides to Enhance the Thermal Stability and Flame Retardancy of Poly(Lactic Acid)

“…Nevertheless, MgAlY-APP-LDHs contained a small number of low-intensity Bragg peaks. This may be because LDHs have become more amorphous, so the coherence along the platelet accumulation axis (c-axis) to notice any highintensity (001) Bragg reflection [45]. By comparing the XRD patterns of APP and LDHs, it can be found that no characteristic peaks of APP were observed in LDHs, which also confirms that APP molecules were successfully inserted into the interlayer of LDHs.…”