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Preparation, mechanical properties, and thermal degradation of flame retarded epoxy resins with an organophosphorus oligomer

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Abstract

An organophosphorus oligomer, poly(DOPO-substituted hydroxyphenyl methanol pentaerythritol diphosphonate) (PFR), was synthesized from the dehydrohalogenation polycondensation of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide substituted hydroxyphenyl methanol (DOPO-HBA) with 3,9-bis(chloro)-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5]undecane-3,9-dioxide (SPDPC). The structure of PFR was confirmed by FTIR, 1H NMR, and 31P NMR. Advanced flame retardant epoxy resins (FREP) were obtained by incorporating PFR into EP, cured by 4,4′-diaminodiphenylmethane (DDM). Effects of PFR on thermal, dynamic mechanical properties, and flame retardant properties of the epoxy resins were investigated. The dynamic mechanical analysis (DMA) results showed that EP/PFR exhibited higher glass transition temperature than that of neat EP. Moreover, incorporation of PFR significantly enhanced the char yield at higher temperatures. The addition of PFR into epoxy resins significantly improved their flame retardancy, due to the reduction of peak heat release rate, total heat release as well as the mass loss rate.

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Acknowledgments

The work was financially supported by National Natural Science Foundation of China (No.51036007), the joint fund of NSFC and CAAC (No. 61079015) and the youth innovation fund of USTC.

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Authors and Affiliations

  1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China

    Xin Wang, Yuan Hu, Lei Song, Weiyi Xing & Hongdian Lu

  2. Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, Jiangsu, 215123, People’s Republic of China

    Xin Wang & Yuan Hu

  3. Department of Chemical and Materials Engineering, Key Laboratory of Powder and Energy Materials, Hefei University, Hefei, Anhui, 230022, People’s Republic of China

    Hongdian Lu

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  1. Xin Wang
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  2. Yuan Hu
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  3. Lei Song
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  4. Weiyi Xing
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Correspondence to Yuan Hu.

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Wang, X., Hu, Y., Song, L. et al. Preparation, mechanical properties, and thermal degradation of flame retarded epoxy resins with an organophosphorus oligomer. Polym. Bull. 67, 859–873 (2011). https://doi.org/10.1007/s00289-011-0473-4

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  • DOI: https://doi.org/10.1007/s00289-011-0473-4

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