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Synergistic effects of P and Si on the flame retardancy in a polymethylsilsesquioxane aerogel prepared under ambient pressure drying

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Abstract

Polymethylsilsesquioxane (PMSQ) aerogels have been developed for diverse applications owing to their excellent flexibility and hydrophobicity. PMSQ aerogels, however, are limited by their flammability and low thermal stability. In this study, transparent and robust PMSQ aerogels were synthesized using an environmentally friendly flame retardant, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-vinyltrimethoxysilane (DOPO) in a facile one-pot manner and successfully dried under ambient pressure without cracks. Briefly, methyltrimethoxysilane (MTMS) and another synthesized precursor, DOPO-vinyltrimethoxysilane (DOPO-VTMS), where DOPO and VTMS were covalently bonded, were used to prepare a DOPO-VTMS MTMS aerogel via co-hydrolytic condensation. The DOPO-VTMS MTMS aerogel showed excellent flame retardancy with a peak heat release rate of 23.48 W g−1, which is 60% lower than that of the MTMS aerogel. It also exhibited enhanced thermal stability, as confirmed by thermogravimetric analysis, originating from the synergistic effect of P and Si. Furthermore, the compressive strength of the DOPO-VTMS MTMS aerogel was 26 times higher than that of the MTMS aerogel. With superior thermal properties and mechanical robustness, the preparation strategy employed in this study can contribute to the development of PMSQ aerogels for various applications such as thermal insulation for buildings, flame-retardant airspace dust collectors, or fire preventive coatings for fabrics.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. 2020R1A5A1019131).

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Authors and Affiliations

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, People’s Republic of China

    Ye Seo Park & Yingjie Qian

  2. Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon, 22212, South Korea

    Ye Seo Park, Jinkyu Choi, Byeong Seok Kim, Sung-Hyeon Baeck, Sang Eun Shim & Yingjie Qian

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  1. Ye Seo Park
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  2. Jinkyu Choi
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  3. Byeong Seok Kim
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Contributions

YSP: Writing—original draft, Formal analysis, Investigation, Visualization. JC: Validation. BSK: Software. S-HB: Resources. SES: Conceptualization, Supervision, Resources. YQ: Supervision, Investigation, Writing—review & editing.

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Correspondence to Sang Eun Shim or Yingjie Qian.

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Park, Y.S., Choi, J., Kim, B.S. et al. Synergistic effects of P and Si on the flame retardancy in a polymethylsilsesquioxane aerogel prepared under ambient pressure drying. J Therm Anal Calorim 148, 7623–7632 (2023). https://doi.org/10.1007/s10973-023-12244-8

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  • DOI: https://doi.org/10.1007/s10973-023-12244-8

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