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Flame‐retardant and mechanical properties of phenolic foams toughened with polyethylene glycol phosphates
Author(s) -
Sui Xiaoyu,
Wang Zhengzhou
Publication year - 2013
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3121
Subject(s) - limiting oxygen index , materials science , thermogravimetric analysis , polyethylene glycol , fire retardant , cone calorimeter , thermal stability , composite material , toughness , fourier transform infrared spectroscopy , polyethylene , peg ratio , chemical engineering , pyrolysis , char , engineering , finance , economics
Three kinds of polyethylene glycol phosphates (PEGPs) toughening agents were synthesized by esterification of phosphorus pentoxide (P 2 O 5 ) with polyethylene glycol and characterized by Fourier transform infrared spectra and 31 P 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.