Flame‐retardant and mechanical properties of phenolic foams toughened with polyethylene glycol phosphates |
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| Authors: | Xiaoyu Sui Zhengzhou Wang |
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| Affiliation: | 1. School of Materials Science and Engineering, Tongji University, , Shanghai, 201804 China;2. Key Laboratory of Advanced Civil Engineering Materials, Chinese Ministry of Education, Tongji University, , Shanghai, 201804 China |
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| Abstract: | Three kinds of polyethylene glycol phosphates (PEGPs) toughening agents were synthesized by esterification of phosphorus pentoxide (P2O5) with polyethylene glycol and characterized by Fourier transform infrared spectra and 31P nuclear magnetic resonance. A series of lightweight phenolic foams toughened with different loadings of PEGPs were prepared. Optical microscopy results show that the addition of PEGPs with small molecular weight PEG improves the structural homogeneity of phenolic foams obviously. The flame retardancy of toughened phenolic foams was evaluated by using UL 94, limiting oxygen index, and cone calorimeter. The results indicate that the incorporation of PEGPs not only increases the toughness of phenolic foams but also improves their flame retardancy. Moreover, the thermal stability of PEGPs and the toughened foams was investigated by thermogravimetric analysis. Copyright © 2013 John Wiley & Sons, Ltd. |
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| Keywords: | phenolic foams polyethylene glycol phosphates toughening flame retardancy mechanical properties |
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