Abstract
Metal–organic frameworks (MOFs) begin to be used as flame retardants in polymer in recent years. Currently, most of researches focus on the traditional MOFs, which are designed for gas storage and separation fields. Herein, we reported that the zeolitic imidazolate frameworks with high nitrogen content (N-ZIF-8) were designed for producing more nitrogen-containing compounds to dilute the flammable gas. Subsequently, the effect of N-ZIF-8 on fire safety of RPUF was investigated. The results showed that the percentage of N in N-ZIF-8 increases by 79.17% from 26.12% (ZIF-8) to 46.80% and non-flammable gases produced by N-ZIF-8 is much more in early stage, which benefits to dilute the flammable gas during combustion. Furthermore, N-ZIF-8 increased the char residue of RPUF composites to more than 20% at 800 °C. At 300 s, the total heat release of Ref. RPUF reaches 36.48 MJ m−2, while the THR of RPUF1 and RPUF3 reaches 30.32 MJ m−2 and 26.20 MJ m−2, respectively. In conclusion, zeolitic imidazolate frameworks with high nitrogen was prepared and showed the considerable potential for application as flame retardant.
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Acknowledgements
This work is a project funded by the National Natural Science Foundation of China (No. 51806113), Shandong Provincial Major Science and Technology Innovation Program (2022CXGC020401), Natural Science Foundation of Shandong Province (ZR2023QE114).
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Liang, C., Lin, W., Liu, Y. et al. Preparation of zeolitic imidazolate frameworks with high nitrogen as an effective flame retardant to enhance flame retardancy of rigid polyurethane foam. J Therm Anal Calorim 148, 9511–9518 (2023). https://doi.org/10.1007/s10973-023-12348-1
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DOI: https://doi.org/10.1007/s10973-023-12348-1