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Flame retardancy of linear polyurethane with Diels–Alder adducts

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Abstract

Flame retardant polyurethane was synthesized via introducing thermally reversible covalent Diels–Alder (DA) adducts into the polyurethane main chain. Firstly, furan-terminated polyurethane prepolymer(PU-Furan) was synthesized from the reaction between isocyanate-terminated prepolymer with or without DOPO-based polyester polyols and furfuryl amine. Secondly, polyurethane with DA adducts (PU-DA) was obtained via Diels–Alder reaction between PU-Furan and commercial 1,1′-(methylenedi-1,4-phenylene) bismaleimide. PU-Furan and PU-DA were characterized by DSC, TGA and 1H NMR, confirming the introduction of the DA adducts into the polyurethane chain. The results of the limiting oxygen index test, Underwriter Laboratory 94 vertical burning (UL-94) test and cone calorimeter test demonstrated that the introduction of the DA adducts improved the flame retardancy of the polyurethane significantly, especially when the polyurethane with flame-retardant element P, due to the synergism flame-resistant effect between flame-retardant element P and thermally reversible DA adducts.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Granted No. 201805035). This project is also supported by the Science and Technology Development Projects of the Central Committee Guidance Local (No. 2018L3015). This is supported by the Natural Science Foundation Guidance Projects of Fujian Province (No. 2021Y0010).

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Authors and Affiliations

  1. Quangang Petrochemical Research Institute, Fujian Normal University, Quanzhou, 362807, China

    Mingxin Cai, Zeying Tian, Tianxiang Fan & Pengfei Du

  2. PetroChina KunLun Lubricant Qualification Test Center, Lanzhou, 730060, China

    Liang Cui

  3. Fujian Key Laboratory of Pollution Control and Resource Reuse, Fuzhou, 350007, China

    Pengfei Du

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  1. Mingxin Cai
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  2. Zeying Tian
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  3. Liang Cui
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Correspondence to Pengfei Du.

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Cai, M., Tian, Z., Cui, L. et al. Flame retardancy of linear polyurethane with Diels–Alder adducts. Polym. Bull. 80, 4195–4207 (2023). https://doi.org/10.1007/s00289-022-04229-8

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  • DOI: https://doi.org/10.1007/s00289-022-04229-8

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