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Preparation and properties of flame retardant epoxy resin modified by additive nitrogen-containing POSS-based molecule with eight DOPO units

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Abstract

Octa-N-phenylaminopropyl-POSS (Octa-NAPA-POSS), DOPO and paraformaldehyde were used to synthesize Octa-DOPO-POSS through the Kabachnik-Fields reaction. It was added into epoxy resin with different ratio to prepare a series of modified epoxy resin composites. The results proved that the addition of flame retardant Octa-DOPO-POSS significantly improved the thermal property, flame retardant performance and moisture resistance of epoxy resin without weakening the mechanical properties. When the addition amount of Octa-DOPO-POSS was 5 wt%, the LOI value of the cured EP/Octa-DOPO-POSS composite increased to 33.9%. Its UL-94 level reached V-0 rating, and the THR and PHRR were significantly reduced. Meanwhile, the flexural modulus and breaking elongation were improved. Moreover, as the adding amount increased the residual char yield of EP/Octa-DOPO-POSS composites also increased, while the maximum thermal weight loss rate gradually decreased. The real-time FTIR and SEM analysis of the char residue after high temperature pyrolysis proved that Octa-DOPO-POSS could promote the char formation and produce a denser char layer. Overall, the combination of POSS and DOPO at a molecular level rather than physical mixing has a positive and significant effect on the flame retardancy of epoxy resin.

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (U1805253, 51973179) and Scientific and Technological Innovation Platform of Fujian Province (2014H2006).

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Authors and Affiliations

  1. College of Materials, Fujian Provincial Key Laboratory of Fire Retardant Materials, Department of Materials Science and Engineering, Xiamen University, Xiamen, 361005, Fujian, China

    Rong Hu, Kaibin He, Xianghong Zheng, Birong Zeng, Guorong Chen, Yiting Xu, Conghui Yuan, Weiang Luo & Lizong Dai

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  1. Rong Hu
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  2. Kaibin He
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Correspondence to Birong Zeng.

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Hu, R., He, K., Zheng, X. et al. Preparation and properties of flame retardant epoxy resin modified by additive nitrogen-containing POSS-based molecule with eight DOPO units. J Polym Res 28, 195 (2021). https://doi.org/10.1007/s10965-021-02553-7

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  • DOI: https://doi.org/10.1007/s10965-021-02553-7

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