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Effect of multiwalled carbon nanotubes and phenethyl-bridged DOPO derivative on flame retardancy of epoxy resin

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Abstract

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.

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Acknowledgements

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).

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Authors and Affiliations

  1. School of Chemistry and Materials Engineering, Guiyang University, Guiyang, 550005, People’s Republic of China

    Wei Yan, Tao Wang & Chunzhi Wen

  2. National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, People’s Republic of China

    Wei Yan, Jie Yu, Shuhao Qin & Weijiang Huang

  3. School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, People’s Republic of China

    Wei Yan & Mingqiu Zhang

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  1. Wei Yan
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  2. Jie Yu
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  6. Shuhao Qin
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Correspondence to Wei Yan.

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Yan, W., Yu, J., Zhang, M. et al. Effect of multiwalled carbon nanotubes and phenethyl-bridged DOPO derivative on flame retardancy of epoxy resin. J Polym Res 25, 72 (2018). https://doi.org/10.1007/s10965-018-1472-z

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