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<p>Study on non-isocyanate polyurethane (NIPU) has been gaining attention as an environmentally friendly alternative to conventional polyurethane. However, current non-isocyanate polyurethane foams (NIPUFs) face limitations in practical applications due to its low mechanical strength and limited flame retardancy. In this study, tannic acid-based non-isocyanate polyurethane resins were synthesized using tannic acid with good chemical reactivity and flame retardancy as precursors. Tannic acid-based non-isocyanate rigid polyurethane foam (T-NIPUF) was then prepared using hexamethylenetetramine, citric acid, and glutaraldehyde as crosslinking agents. The structure of the synthesized T-NIPUF was analyzed using FT-IR and <sup>1</sup>H NMR, and the mechanical properties and flame retardancy according to the various crosslinking agent contents were evaluated by UTM, SEM, TGA, LOI, and ignition tests.</p>

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Study on the mechanical properties and flame retardancy of tannic acid-based non-isocyanate rigid polyurethane foam according to the content of crosslinking agents

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月26日

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  • Sung Yeol Lim,
  • Su Bin Park,
  • Min Seok Kim,
  • Sang-Bum Kim

摘要

Study on non-isocyanate polyurethane (NIPU) has been gaining attention as an environmentally friendly alternative to conventional polyurethane. However, current non-isocyanate polyurethane foams (NIPUFs) face limitations in practical applications due to its low mechanical strength and limited flame retardancy. In this study, tannic acid-based non-isocyanate polyurethane resins were synthesized using tannic acid with good chemical reactivity and flame retardancy as precursors. Tannic acid-based non-isocyanate rigid polyurethane foam (T-NIPUF) was then prepared using hexamethylenetetramine, citric acid, and glutaraldehyde as crosslinking agents. The structure of the synthesized T-NIPUF was analyzed using FT-IR and 1H NMR, and the mechanical properties and flame retardancy according to the various crosslinking agent contents were evaluated by UTM, SEM, TGA, LOI, and ignition tests.