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Synergistic effects between silicon-containing flame retardant and DOPO on flame retardancy of epoxy resins

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Abstract

A novel flame retardant, containing silicon and nitrogen (PSiN), was synthesized, and it was used together with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) to prepare a flame-retardant system for epoxy resins (EP). Flammability and thermal behaviors of EP systems were estimated by limited oxygen index (LOI), vertical burning test (UL-94), microscale combustion calorimetry test and thermogravimetric analysis. The results showed that synergistic effects on the flame retardancy of EP composites existed between the DOPO and PSiN. When 3 % PSiN and 7 % DOPO were incorporated, the LOI value of EP was found to be 34 %, and the UL-94 test found to be class V-0. The microstructures observed by scanning electron microscopy and FTIR indicated that the surface of the char for EP/DOPO/PSiN system holds a more cohesive and denser char structure when compared to the pure EP and EP/DOPO systems.

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Acknowledgements

We would like to thank the generous financial support by the following grant: Applied basic research project of Sichaun Technology Department, Grant No. 2014JY0138.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China

    Le Zhang, Youchuan Wang, Qiang Liu & Xufu Cai

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  1. Le Zhang
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  2. Youchuan Wang
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  3. Qiang Liu
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  4. Xufu Cai
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Correspondence to Xufu Cai.

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Zhang, L., Wang, Y., Liu, Q. et al. Synergistic effects between silicon-containing flame retardant and DOPO on flame retardancy of epoxy resins. J Therm Anal Calorim 123, 1343–1350 (2016). https://doi.org/10.1007/s10973-015-5046-6

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  • DOI: https://doi.org/10.1007/s10973-015-5046-6

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