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Novel DOPO-based epoxy curing agents

Synthesis and the structure–property relationships of the curing agents on the fire safety of epoxy resins

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Abstract

A series of DOPO-based curing agents with similar structures were prepared through Mannich-type reaction and characterized. The curing agents with weak electron-donating methylene groups, strong electron-withdrawing sulfonyl groups and strong electron-donating ether groups were then incorporated into epoxy resins, and the structure–property relationships of the curing agents on the fire safety of epoxy resins were investigated. Thermal and flame-retardant properties of the resins were investigated by thermogravimetric analysis, cone calorimeter, microscale combustion colorimeter, UL-94 and limiting oxygen index. The results showed that the curing agents with proper structure could impart epoxy resins with high thermal stabilities and low flammability. The curing agents containing ether groups exhibited better flame-retardant efficiency compared with other curing agents. In order to further investigate the mechanism, the char residues of the resins were studied by scanning electron microscopy, Fourier transform infrared and Raman spectroscopy. Char residues of the resins containing ether groups exhibited a condense char morphology, associated with a high degree of graphitization. This work not only provides novel epoxy resins with good thermal stability, but also will trigger more scientific interest in the development and investigation of the structure–property relationships of the DOPO-based flame retardants.

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Acknowledgements

This work was supported by Natural Science Foundation of Hebei Province (No. E2016507032), the Natural Science Foundation of China (No. 51503067 and No. 21472241) and China Postdoctoral Science Foundation (No. 2015M572309).

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Authors and Affiliations

  1. Key Lab Firefighting and Rescuing Technology, Ministry of Public Security, Chinese People’s Armed Police Force Academy, Xichang Road 220, Langfang City, 065000, Hebei Province, People’s Republic of China

    Xiaodong Qian

  2. State Key Laboratory of Fire Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, 230027, Anhui, People’s Republic of China

    Lei Song & Yuan Hu

  3. School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou, 510641, People’s Republic of China

    Saihua Jiang

Authors
  1. Xiaodong Qian
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  2. Lei Song
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  3. Yuan Hu
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  4. Saihua Jiang
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Correspondence to Xiaodong Qian or Yuan Hu.

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Qian, X., Song, L., Hu, Y. et al. Novel DOPO-based epoxy curing agents. J Therm Anal Calorim 126, 1339–1348 (2016). https://doi.org/10.1007/s10973-016-5604-6

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  • DOI: https://doi.org/10.1007/s10973-016-5604-6

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