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Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams

Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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Academic Editors: Evroula Hapeshi, John Vakros, Catia Cannilla and Giuseppe Bonura
Polymers 2022, 14(3), 420; https://doi.org/10.3390/polym14030420
Received: 20 December 2021 / Revised: 12 January 2022 / Accepted: 18 January 2022 / Published: 21 January 2022
Flame-retardant water-blown rigid polyurethane foams (RPUFs) modified by ammonium polyphosphate (APP) and diethyl ethylphosphonate (DEEP) were synthesized by a one-pot free-rising method. We performed scanning electron microscopy (SEM), compression strength tests, acoustic absorption measurements and thermogravimetric analysis, as well as limited oxygen index, vertical burning and cone calorimeter tests to investigate the mechanical properties, acoustic performance and flame retardancy of the foams. SEM confirmed that the open-cell structures of the foams were successfully constructed with the introduction of a cell-opening agent. Upon using 20 php APP, the average acoustic absorption coefficient of the foam reached 0.535 in an acoustic frequency range of 1500–5000 Hz. The results of thermogravimetric analysis demonstrated that the incorporation of APP and DEEP can effectively restrain mass loss of RPUFs during pyrolysis. In particular, the compressive strength of a foam composite containing 5 php APP and 15 php DEEP increased to 188.77 kPa and the LOI value reached 24.9%. In a vertical burning test and a cone calorimeter test, the joint use of APP and DEEP endowed RPUFs with a V-0 rating and they attained a THR value of 23.43 MJ/m2. Moreover, the addition of APP improved the acoustic absorption performance of the foam, verified by acoustic absorption measurements. Considering potential applications, the formulation containing 15 php APP and 5 php DEEP could be used in the preparation of a new flame-retardant acoustic absorption rigid polyurethane foam. View Full-Text
Keywords: rigid polyurethane foam; acoustic absorption; flame retardant; open-cell structure rigid polyurethane foam; acoustic absorption; flame retardant; open-cell structure
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MDPI and ACS Style

Zhang, H.; LYU, X.; Huang, Z.; Yan, Y. Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams. Polymers 2022, 14, 420. https://doi.org/10.3390/polym14030420

AMA Style

Zhang H, LYU X, Huang Z, Yan Y. Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams. Polymers. 2022; 14(3):420. https://doi.org/10.3390/polym14030420

Chicago/Turabian Style

Zhang, Huiping, Xiongxian LYU, Zijun Huang, and Ying Yan. 2022. "Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams" Polymers 14, no. 3: 420. https://doi.org/10.3390/polym14030420

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