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<p>The metal–organic framework MIL-88A and aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) were employed to enhance the flame retardancy of silicone rubber foams (SiFs). Initially, MIL-88A was successfully synthesized and characterized using scanning electron microscopy (SEM), X-ray diffraction, and Fourier transform infrared spectroscopy. Subsequently, the flame retardancy and smoke suppression properties of SiFs incorporating MIL-88A and Al<sub>2</sub>O<sub>3</sub> were evaluated through limiting oxygen index (LOI) tests, cone calorimetry, SEM analysis, and thermogravimetry-infrared spectroscopy. Eventually, the flame retardant and smoke suppression mechanism of SiFs with MIL-88A and Al<sub>2</sub>O<sub>3</sub> were explored. The results demonstrated that the LOI of SiFs with 3&#xa0;mass% MIL-88A and 3&#xa0;mass% Al<sub>2</sub>O<sub>3</sub> was 32.7%. Compared with pure SiFs, the peak heat release rate, total heat release, and total smoke production of SiFs with 3&#xa0;mass% MIL-88A and 3&#xa0;mass% Al<sub>2</sub>O<sub>3</sub> decreased by 54.22%, 51.94%, and 62.47%, respectively. Furthermore, MIL-88A and Al<sub>2</sub>O<sub>3</sub> exhibited a synergistic flame-retardant effect in both the condensed and gas phases. The structure of char residues of SiFs with MIL-88A and Al<sub>2</sub>O<sub>3</sub> was continuous and dense, thereby effectively blocking heat and gas transfer at the critical interface of SiFs.</p>

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Effects of MIL-88A/Al2O3 on the flame retardancy and smoke suppression of silicone rubber foams

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Furu Kang,
  • Jiayao Tu,
  • Lan Zhang,
  • Jun Deng,
  • Xin Yi,
  • Jiahao Song,
  • Lanlan Guo

摘要

The metal–organic framework MIL-88A and aluminum oxide (Al2O3) were employed to enhance the flame retardancy of silicone rubber foams (SiFs). Initially, MIL-88A was successfully synthesized and characterized using scanning electron microscopy (SEM), X-ray diffraction, and Fourier transform infrared spectroscopy. Subsequently, the flame retardancy and smoke suppression properties of SiFs incorporating MIL-88A and Al2O3 were evaluated through limiting oxygen index (LOI) tests, cone calorimetry, SEM analysis, and thermogravimetry-infrared spectroscopy. Eventually, the flame retardant and smoke suppression mechanism of SiFs with MIL-88A and Al2O3 were explored. The results demonstrated that the LOI of SiFs with 3 mass% MIL-88A and 3 mass% Al2O3 was 32.7%. Compared with pure SiFs, the peak heat release rate, total heat release, and total smoke production of SiFs with 3 mass% MIL-88A and 3 mass% Al2O3 decreased by 54.22%, 51.94%, and 62.47%, respectively. Furthermore, MIL-88A and Al2O3 exhibited a synergistic flame-retardant effect in both the condensed and gas phases. The structure of char residues of SiFs with MIL-88A and Al2O3 was continuous and dense, thereby effectively blocking heat and gas transfer at the critical interface of SiFs.