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Synergistic Flame-retardant Effect of Epoxy Resin Combined with Phenethyl-bridged DOPO Derivative and Graphene Nanosheets

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Abstract

Phenethyl-bridged DOPO derivative (DiDOPO) was combined with graphene nanosheets (GNSs) in epoxy resin (EP) to improve its flame retardancy. The results indicated that the introduction of only 1.5 wt% DiDOPO/1.5 wt% GNS in EP increased the limited oxygen index (LOI) from 21.8% to 32.2%, hence meeting UL 94 V-0 rating. The thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous char. The decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR), and the release of large amounts of phosphorus was detected in the gas phase. The evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/GNS. The latter was further confirmed by digital photography and scanning electron microscopy (SEM). Also, Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during combustion. Overall, the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.

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Acknowledgments

This work was financially supported by the Guizhou Science and Technology Cooperation Project (No. 20157304) and the Natural Science Foundation of Education Department of Guizhou Province (No. 2015400).

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Authors and Affiliations

  1. School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China

    Wei Yan & Ming-Qiu Zhang

  2. School of Chemistry and Materials Engineering, Guiyang University, Guiyang, 550005, China

    Wei Yan, Sheng-Qiang Nie & Dai-Qin Zhang

  3. National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, China

    Wei Yan, Jie Yu & Shu-Hao Qin

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  1. Wei Yan
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  2. Ming-Qiu Zhang
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  3. Jie Yu
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Correspondence to Wei Yan or Ming-Qiu Zhang.

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Yan, W., Zhang, MQ., Yu, J. et al. Synergistic Flame-retardant Effect of Epoxy Resin Combined with Phenethyl-bridged DOPO Derivative and Graphene Nanosheets. Chin J Polym Sci 37, 79–88 (2019). https://doi.org/10.1007/s10118-019-2175-6

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