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This work utilizes eutectic mixtures of molten NaOH-KOH (1:1 mol) as a reaction medium to recover chemical monomers and clean carbon fibers (CFs) from composite waste. In this novel process, an amine-cured bisphenol A diglycidyl ether (DGEBA) carbon fiber-reinforced polymer (CFRP) composite (Tg > 178 °C) was first swelled in benzyl alcohol at 185 °C for 5 h. After swelling, the CFRP matrix was fully dissolved in a molten NaOH-KOH eutectic mixture within 30 min at 220 °C. We further show a separation strategy to isolate the different organic products, such as aniline, 3-aminophenol, and phenolic monomers. These phenolics include the building block bisphenol A (BPA), which is collected in high yield (86%). Additionally, the architecture, strength (>92%) and modulus (>99%) of recovered CFs are well-preserved and fit for reuse. This process addresses the challenges of recycling aerospace grade thermoset CFRPs by enabling the recovery of both high quality CFs and monomeric chemicals.

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Efficient Depolymerization of Amine-Cured Epoxy Composite and Recovery of Bisphenol-A by NaOH-KOH Eutectic

  • 会议论文

  • 发表日期：

    2026年

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  • Y. Justin Lim,
  • Zehan Yu,
  • Valeriy Cherepakhin,
  • Steven R. Nutt,
  • Travis J. Williams

摘要

This work utilizes eutectic mixtures of molten NaOH-KOH (1:1 mol) as a reaction medium to recover chemical monomers and clean carbon fibers (CFs) from composite waste. In this novel process, an amine-cured bisphenol A diglycidyl ether (DGEBA) carbon fiber-reinforced polymer (CFRP) composite (Tg > 178 °C) was first swelled in benzyl alcohol at 185 °C for 5 h. After swelling, the CFRP matrix was fully dissolved in a molten NaOH-KOH eutectic mixture within 30 min at 220 °C. We further show a separation strategy to isolate the different organic products, such as aniline, 3-aminophenol, and phenolic monomers. These phenolics include the building block bisphenol A (BPA), which is collected in high yield (86%). Additionally, the architecture, strength (>92%) and modulus (>99%) of recovered CFs are well-preserved and fit for reuse. This process addresses the challenges of recycling aerospace grade thermoset CFRPs by enabling the recovery of both high quality CFs and monomeric chemicals.