Effect of multiwalled carbon nanotubes and phenethyl-bridged DOPO derivative on flame retardancy of epoxy resin
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In this study, a phenethyl-bridged DOPO derivative (DiDOPO) was combined with multi-walled carbon nanotubes (MWNT) in epoxy resin (EP) to improve its flame retardancy. The introduction of only 10 wt% DiDOPO/0.8 wt% MWNT into EP increased the limited oxygen index (LOI) from 21.8% to 38.6%, achieving the UL 94 V-0 rating. The thermogravimetric analyses demonstrated that the presence of MWNT raised the char yield and formed thermally stable carbonaceous char. The decomposition and pyrolysis products in the gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR), and found large amounts of phosphorus released into the gas phase. The flame-retardant effect evaluation by cone calorimetry testified that the MWNT improved the protective-barrier effect of the fire residue of EP/DiDOPO/MWNT, as shown by digital photo and scanning electron microscopy (SEM). Raman showed that MWNT could enhance the graphitization degree of the resin during combustion. Overall, these findings indicated that combination of DiDOPO with MWNT is an effective way in developing high-performance resins with attractive flame retardancy.
KeywordsEpoxy resin DiDOPO MWNT Flame retardancy
This work was supported by the Guizhou Science and Technology Cooperation Project (20157304) and the Natural Science Foundation of Education Department of Guizhou Province (2015400).
- 1.Martins MSS, Schartel B, Magalhães FD, Pereira CMC (2016) The effect of traditional flame retardants, nanoclays and carbon nanotubes in the fire performance of epoxy resin composites. Fire Mater 301:9–35Google Scholar
- 26.Yao Q, Wang J, Mack AG. (2015) Process for the preparation of DOPO-derived compounds and compositions thereof. U.S. Patent 9,012,546,Google Scholar
- 34.Brehme S, Köppl T, Schartel B, Altstädt V (2014) Competition in aluminium phosphinate-based halogen-free flame retardancy of poly(butylene terephthalate) and its glass-fibre composites. e-Polymers 14(3):193–208Google Scholar
- 42.Perret B, Schartel B, Stöß K, Ciesielski M, Diederichs J, Döring M, Krämer J, Altstädt V (2011) A New Halogen-Free Flame Retardant Based on 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide for Epoxy Resins and their Carbon Fiber Composites for the Automotive and Aviation Industries. Macromol Mater Eng 296(1):14–30CrossRefGoogle Scholar
- 48.Schartel B, Balabanovich AI, Braun U, Knoll U, Artner J, Ciesielski M, Döring M, Perez R, Sandler JKW, Altstädt V, Hoffmann T, Pospiech D (2007) Pyrolysis of epoxy resins and fire behavior of epoxy resin composites flame-retarded with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide additives. J Appl Polym Sci 104(4):2260–2269CrossRefGoogle Scholar