| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Efficient Depolymerization of Amine-Cured Epoxy Composite and Recovery of Bisphenol-A by a NaOH_KOH Eutectic |
| Author(s) |
Justin Lim, Zehan Yu, Valeriy Cherepakhin, Travis J. Williams, Steven R. Nutt |
| On-Site Speaker (Planned) |
Justin Lim |
| Abstract Scope |
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°) was first swelled in benzyl alcohol at 185 ° for 5 hours. After swelling, the CFRP matrix was fully dissolved in a molten NaOH-KOH eutectic mixture within 30 minutes at 220 °. 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. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |