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Flame retardancy and smoke suppression of silicone foams with modified microencapsulated Mg/Zn/Al-layered double hydroxide

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Abstract

Silicone foams (SiFs) are high-performance materials but can combust and release choking smoke in a fire. In this paper, the modified microencapsulated Mg/Zn/Al-layered double hydroxide (MLDHs) was prepared by the sol–gel method. Then, the structure and performance of modified MLDHs were characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetry (TG), and differential scanning calorimetry (DSC). Besides, the mechanical properties, flame retardancy, smoke suppression, thermal degradation behavior, morphology and composition of carbon slag of SiFs with modified MLDHs were tested using the universal tensile testing machine, limiting oxygen index (LOI), UL-94 test, cone calorimeter, thermogravimetry, SEM–EDS and XPS. The results indicated that the modified MLDHs could effectively improve the ductility of SiFs. When the addition of modified MLDHs exceeded 20 mass%, SiFs could be improved to UL-94-V0 rating. The PHRR, THR, and TSP of SiFs with 30 mass% modified MLDHs were 56.04%, 46.86%, and 80.49% lower than that of pure SiFs. Furthermore, the decomposition products of modified MLDHs/SiFs composite such as SiO2 and zinc magnesium aluminum oxide could improve the char formation significantly. The continuous, complete, and dense structure of carbon slag of modified MLDHs/SiFs could effectively block the exchange of heat and gas on the surface of SiFs and reduce the combustion performance of SiFs.

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Acknowledgements

The work was financially supported by Youth project of National Natural Science Foundation of China (52104219, 51904233); National Natural Science Foundations of China (51774232, 52074218); Preferential funding project for scientific and technological activities of overseas students in Shaanxi Province (2021003).

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Authors and Affiliations

  1. Center for Post-Doctoral Studies, Xi’ an University of Science and Technology (XUST), Xi’ an, 710054, People’s Republic of China

    Furu Kang

  2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, XUST, Xi’ an, 710054, People’s Republic of China

    Furu Kang, Jun Deng, Bo Liu, Xin Yi & Hang Li

  3. Shaanxi Coal and Chemical New Energy Group Co., Ltd, Xi’an, 710102, People’s Republic of China

    Qingtao Pang

  4. Work Safety Key Lab On Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Xiangtan, 411201, People’s Republic of China

    Furu Kang & Chao Yuan

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  1. Furu Kang
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  2. Jun Deng
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Correspondence to Furu Kang.

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Kang, F., Deng, J., Pang, Q. et al. Flame retardancy and smoke suppression of silicone foams with modified microencapsulated Mg/Zn/Al-layered double hydroxide. J Therm Anal Calorim 148, 4731–4743 (2023). https://doi.org/10.1007/s10973-022-11901-8

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