碳纖維強化複合材料 (Carbon Fiber Reinforced Polymer, CFRP) 因具有高強度、輕量化及耐腐蝕等優點，已被廣泛應用於航空航太、汽車及風力發電等領域。然而，CFRP所使用之熱固性環氧樹脂具有高度交聯結構，使其難以回收再利用。因此，本研究探討不同熱處理及化學回收方法對CFRP中環氧樹脂之去除效果，評估碳纖維回收之可行性。
本研究以拉擠成型碳板為研究對象，分別進行高溫熱處理、DMAC溶脹、FeCl2/H2O2/EG氧化降解、高壓反應釜氧化降解及硝酸氧化降解實驗，並利用熱重分析 (TGA)、傅立葉轉換紅外光譜分析 (FTIR) 及掃描式電子顯微鏡 (SEM) 進行評估。
結果顯示，原始樣品中樹脂含量約為30 wt.%。熱處理實驗中，600°C持溫15分鐘即可達到100% 樹脂降解率，且碳纖維保留率達98.80%，為最佳熱處理條件。DMAC雖可有效促進樹脂溶脹，但對樹脂去除效果有限。FeCl2/H2O2/EG氧化系統之樹脂降解率皆低於5%，即使將樣品粉碎至80mesh，最高降解率亦僅達8.85%。相較之下，硝酸氧化系統於8M HNO3、90°C及12小時條件下，樹脂降解率可達95.94%，並有效破壞環氧樹脂結構。
綜上所述，高溫熱處理法與硝酸氧化法皆能有效去除CFRP中之環氧樹脂。其中熱處理法具有反應快速之優點，而硝酸氧化法則可於較低溫度下達到良好之樹脂去除效果，顯示其具有應用於CFRP回收之潛力。

Carbon fiber reinforced polymer (CFRP) composites are widely used in the aerospace, automotive, and wind energy industries because of their high specific strength and lightweight characteristics. However, the thermoset epoxy matrix makes recycling difficult and creates increasing environmental concerns associated with end-of-life CFRP waste. This study investigated the removal of epoxy resin from CFRP using thermal treatment and diverse chemical recycling methods.
For pultruded CFRP, thermal treatment was conducted at various temperatures and holding times. Chemical recycling involved a two-step process consisting of DMAC swelling pretreatment followed by oxidative degradation using FeCl2/H2O2/EG systems under reflux and autoclave conditions. In addition, a nitric acid oxidation system was evaluated. The recovered materials were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and resin degradation calculations.
The results showed that thermal treatment at temperatures above 600°C achieved complete resin removal, whereas higher temperatures increased carbon fiber oxidation. The DMAC swelling process achieved a maximum swelling ratio of 88.02%, but the resin removal efficacy was limited. The FeCl2/H2O2/EG oxidation system showed poor degradation performance, with resin degradation rates below 10%. In contrast, the nitric acid oxidation system achieved a resin degradation rate of 95.94% and effectively destroyed the cross-linked structure of the epoxy resin.
Overall, thermal treatment and nitric acid oxidation were effective approaches for epoxy resin removal from CFRP. Among the chemical methods investigated, nitric acid oxidation demonstrated the most promising recycling performance under relatively mild operating conditions.

[1] GWSToolGroup, "What is CFRP? Understanding Carbon Fiber Reinforced Polymer," GWSTool Group Blog, 2026. [Online]. Available: https://www.gwstoolgroup.com/what-is-cfrp/. [Accessed: Jul. 10, 2026].
[2] Mitsubishi Chemical, "Carbon fiber reinforced plastics (CFRP) molded products," Mitsubishi Chemical's Carbon Fiber and Carbon Fiber Composite Materials Special Site, 2026. [Online]. Available: m-chemical.co.jp. [Accessed: Jul. 10, 2026].
[3] K. Yousefpour, M. R. Chalaki, W. Lin, F. Haque, Y. Wang, and C. Park, "The Impact of Lightning Channel Diameter on the Damage of Carbon Fiber Reinforced Polymer Matrix (CFRP) Composite Laminates," in 2020 IEEE Electrical Insulation Conference (EIC), Jun. 22–Jul. 3 2020, pp. 128–131, doi: 10.1109/EIC47619.2020.9158586.
[4] H. Anton, B. Florin, V. Andrei-Daniel, V. Daniel, T. Daniela-Ioana, and A. Cătălin, "Mechanical Characteristics Evaluation of a Single Ply and Multi-Ply Carbon Fiber-Reinforced Plastic Subjected to Tensile and Bending Loads," Polymers, vol. 14, no. 15, p. 3213, Aug. 2022, doi: 10.3390/polym14153213.
[5] UCHIDA, "What is CFRP (Carbon Fiber Reinforced Plastic) Characteristics and Application Fields," UCHIDA Technical News, 2026. [Online]. Available: https://uchida-japan.com/uchidanews/cfrp/what-is-cfrp-carbon-fiber-reinforced-plastic-characteristics-and-application-fields/. [Accessed: Jul. 10, 2026].
[6] Mordor Intelligence, "Carbon Fiber Market Size & Share Analysis - Growth Trends and Forecast (2026 - 2031)," Mordor Intelligence Industry Reports, Jan. 2026. [Online]. Available: https://www.mordorintelligence.com/industry-reports/carbon-fiber-market. [Accessed: Jul. 10, 2026].
[7] University of Sydney, "The looming 840,000 tonne waste problem that isn't single-use plastics," University Home: News & Opinion, Jul. 3, 2023. [Online]. Available: https://www.sydney.edu.au/news-opinion/news/2023/07/03/-the-looming-840-000-tonne-waste-problem-that-isn-t-single-use-p.html. [Accessed: Jul. 10, 2026].
[8] A. Shundo, S. Yamamoto, and K. Tanaka, "Network Formation and Physical Properties of Epoxy Resins for Future Practical Applications," JACS Au, vol. 2, no. 7, pp. 1522–1542, Jul. 2022, doi: 10.1021/jacsau.2c00120.
[9] J.-I. Kim et al., "Recycling of Waste Cross-Linked EVA Using Electron Beam Crosslinking and Pulverizing Technology," Polymers for Advanced Technologies, vol. 36, no. 4, p. e70184, 2025, doi: 10.1002/pat.70184.
[10] J. Wu, X. Gao, Y. Wu, Y. Wang, T. T. Nguyen, and M. Guo, "Recycling Carbon Fiber from Carbon Fiber-Reinforced Polymer and Its Reuse in Photocatalysis: A Review," Polymers, vol. 15, no. 1, p. 170, Dec. 2022, doi: 10.3390/polym15010170.
[11] M. Yuan, Z. Li, and Z. Teng, "Progress and prospects of recycling technology for carbon fiber reinforced polymer," Frontiers in Materials, vol. 11, p. 1484544, Dec. 2024, doi: 10.3389/fmats.2024.1484544.
[12] A. Isa, N. Nosbi, M. Che Ismail, H. Md Akil, W. F. F. Wan Ali, and M. F. Omar, "A Review on Recycling of Carbon Fibres: Methods to Reinforce and Expected Fibre Composite Degradations," Materials, vol. 15, no. 14, p. 4991, Jul. 2022, doi: 10.3390/ma15144991.
[13] Y. Wei and S. A. Hadigheh, "Enhancing carbon fibre recovery through optimised thermal recycling: Kinetic analysis and operational parameter investigation," Materials Today Sustainability, vol. 25, p. 100661, Mar. 2024, doi: 10.1016/j.mtsust.2023.100661.
[14] D. Semitekolos et al., "Performance Restoration of Chemically Recycled Carbon Fibres Through Surface Modification with Sizing," Polymers, vol. 17, no. 1, p. 33, Dec. 2024, doi: 10.3390/polym17010033.
[15] Z. Li, M. Xing, L. Zhao, Z. Li, and Y. Wang, "Recovery of carbon fiber-reinforced polymer waste using dimethylacetamide base on the resin swelling principle," Frontiers in Chemistry, vol. 10, p. 1050827, 2022, doi: 10.3389/fchem.2022.1050827.
[16] P. Y. Chen, R. Feng, Y. Xu, and J. H. Zhu, "Recycling and Reutilization of Waste Carbon Fiber Reinforced Plastics: Current Status and Prospects," Polymers, vol. 15, no. 17, p. 3508, Aug. 2023, doi: 10.3390/polym15173508.
[17] X. Huang, "Fabrication and Properties of Carbon Fibers," Materials, vol. 2, no. 4, pp. 2369–2403, 2009, doi: 10.3390/ma2042369.
[18] Ș. Ursache, C. Cerbu, and A. Hadăr, "Characteristics of Carbon and Kevlar Fibres, Their Composites and Structural Applications in Civil Engineering-A Review," Polymers, vol. 16, no. 1, p. 127, Dec. 2023, doi: 10.3390/polym16010127.
[19] A. Sayam et al., "A review on carbon fiber-reinforced hierarchical composites: mechanical performance, manufacturing process, structural applications and allied challenges," Carbon Letters, vol. 32, no. 5, pp. 1173–1205, 2022, doi: 10.1007/s42823-022-00358-2.
[20] B. M. Tofanica, E. Ungureanu, and F. Awaja, "Surface Chemistry and Molecular Dynamics of Epoxy Resin: Insights from Analysis During Curing and Post-Curing Processes," Polymers, vol. 17, no. 8, p. 1094, Apr. 2025, doi: 10.3390/polym17081094.
[21] I. Karlsson et al., "Nature-Derived Epoxy Resin Monomers with Reduced Sensitizing Capacity─Isosorbide-Based Bis-Epoxides," Chemical Research in Toxicology, vol. 36, no. 2, pp. 281–290, Feb. 2023, doi: 10.1021/acs.chemrestox.2c00347.
[22] J. Yukai, F. Bo, G. Yong, L. Xiaohui, and W. Yanqin, "Efficient degradation of epoxy resin and recovery of carbon fibers from CFREP in mix-solvent system," Chemical Synthesis, vol. 5, no. 2, p. 38, 2025, doi: 10.20517/cs.2024.85.
[23] Z. Dong et al., "Tailoring Epoxy Network Architecture and Stiffness-Toughness Balance Using Competitive Short- and Long-Chain Curing Agents: A Multiscale Simulation Study," Polymers, vol. 17, no. 10, p. 1297, May 2025, doi: 10.3390/polym17101297.
[24] M. S. N. Weerasinghe et al., "Educational series: turning monomers into crosslinked polymer networks," Polymer Chemistry, vol. 14, no. 39, pp. 4503–4514, 2023, doi: 10.1039/D3PY00912B.
[25] Z. Huang, S. Weng, D. Gong, L. Li, X. Yang, and Z. Deng, "A facile and efficient solvothermal degradation route for carbon fiber reinforced epoxy resin composite waste," Journal of Macromolecular Science, Part B, vol. 63, no. 10, pp. 985–997, Oct. 2024, doi: 10.1080/00222348.2023.2295162.
[26] D. Prasad and N. Mitra, "Evolution of Viscosity Upon Crosslinking in Epoxy Resin: An Atomistic Investigation," in Proceedings of the 38th American Society for Composites (ASC) Technical Conference, Lowell, MA, 2023, doi: 10.12783/asc38/36619.
[27] Y. Wang et al., "Chemical Recycling of Carbon Fiber Reinforced Epoxy Resin Composites via Selective Cleavage of the Carbon–Nitrogen Bond," ACS Sustainable Chemistry & Engineering, vol. 3, no. 12, pp. 3332–3337, Dec. 2015, doi: 10.1021/acssuschemeng.5b00949.
[28] Union Composites, "How to dissolve cured epoxy resin," Union Composites Industry News, Aug. 4, 2025. [Online]. Available: https://www.unioncomposites.com/How-to-dissolve-cured-epoxy-resin.html. [Accessed: Jul. 10, 2026].
[29] C. Vogiantzi and K. Tserpes, "Mechanical properties of carbon fibers and fiber/matrix interface recycled from CFRPs via water/ethanol-based solvolysis under various processing conditions," European Journal of Materials, vol. 5, no. 1, p. 2571803, Dec. 2025, doi: 10.1080/26889277.2025.2571803.
[30] D. Borjan, Ž. Knez, and M. Knez, "Recycling of Carbon Fiber-Reinforced Composites-Difficulties and Future Perspectives," Materials, vol. 14, no. 15, p. 4191, Jul. 2021, doi: 10.3390/ma14154191.
[31] D. De Fazio et al., "Mechanical and Solvothermal Recycling of End-of-Life Carbon Fibre-Reinforced Plastic Products: Process Feasibility and Flexural Performance of Recycled Composites," Polymers, vol. 17, no. 7, p. 878, Mar. 2025, doi: 10.3390/polym17070878.
[32] S. Pimenta and S. T. Pinho, "Recycling carbon fibre reinforced polymers for structural applications: Technology review and market outlook," Waste Management, vol. 31, no. 2, pp. 378–392, Feb. 2011, doi: 10.1016/j.wasman.2010.09.019.
[33] L. O. Meyer, K. Schulte, and E. Grove-Nielsen, "CFRP-Recycling Following a Pyrolysis Route: Process Optimization and Potentials," Journal of Composite Materials, vol. 43, no. 9, pp. 1121–1132, 2009, doi: 10.1177/0021998308097737.
[34] S. Palola, P. Laurikainen, S. García-Arrieta, E. Goikuria Astorkia, and E. Sarlin, "Towards Sustainable Composite Manufacturing with Recycled Carbon Fiber Reinforced Thermoplastic Composites," Polymers, vol. 14, no. 6, p. 1098, Mar. 2022, doi: 10.3390/polym14061098.
[35] C. Dega, A. Jadidinia, and R. Boukhili, "A Study on the Effect of an Oxidizing Atmosphere During the Recycling of CFRP by Pyrolysis," Fibers, vol. 13, no. 5, p. 58, 2025, doi: 10.3390/fib13050058.
[36] Y. Ren et al., "Evaluation of Mechanical Properties and Pyrolysis Products of Carbon Fibers Recycled by Microwave Pyrolysis," ACS Omega, vol. 7, no. 16, pp. 13529–13537, Apr. 2022, doi: 10.1021/acsomega.1c06652.
[37] S. Hao, L. He, J. Liu, Y. Liu, C. Rudd, and X. Liu, "Recovery of Carbon Fibre from Waste Prepreg via Microwave Pyrolysis," Polymers, vol. 13, no. 8, p. 1231, Apr. 2021, doi: 10.3390/polym13081231.
[38] X. Kuang, Q. Shi, Y. Zhou, Z. Zhao, T. Wang, and H. J. Qi, "Dissolution of epoxy thermosets via mild alcoholysis: the mechanism and kinetics study," RSC Advances, vol. 8, no. 3, pp. 1493–1502, Jan. 2018, doi: 10.1039/c7ra12787a.
[39] Y. Liu, L. Meng, Y. Huang, and J. Du, "Recycling of carbon/epoxy composites," Journal of Applied Polymer Science, vol. 94, no. 5, pp. 1912–1916, 2004, doi: 10.1002/app.20990.
[40] T. Wajima and K. Yamashita, "Recovery of carbon fiber from carbon fiber reinforced plastics using alkali molten hydroxide," Scientific Reports, vol. 15, no. 1, p. 590, Jan. 2025, doi: 10.1038/s41598-024-84293-4.
[41] R. L. Pérez, C. E. Ayala, M. M. Opiri, A. Ezzir, G. Li, and I. M. Warner, "Recycling Thermoset Epoxy Resin Using Alkyl-Methyl-Imidazolium Ionic Liquids as Green Solvents," ACS Applied Polymer Materials, vol. 3, no. 11, pp. 5588–5595, Nov. 2021, doi: 10.1021/acsapm.1c00896.
[42] P. Xu, J. Li, and J. Ding, "Chemical recycling of carbon fibre/epoxy composites in a mixed solution of peroxide hydrogen and N,N-dimethylformamide," Composites Science and Technology, vol. 82, pp. 54–59, Jun. 2013, doi: 10.1016/j.compscitech.2013.04.002.
[43] C. A. Navarro, E. A. Kedzie, Y. Ma, K. H. Michael, S. R. Nutt, and T. J. Williams, "Mechanism and Catalysis of Oxidative Degradation of Fiber-Reinforced Epoxy Composites," Topics in Catalysis, vol. 61, no. 7-8, pp. 704–709, Jun. 2018, doi: 10.1007/s11244-018-0917-2.
[44] E. Schamel, G. Wehnert, H. Schlachter, and D. Söthje, "Chemical Recycling of Carbon Fiber Reinforced Epoxy Composites Using Mild Conditions," Chemie Ingenieur Technik, vol. 93, no. 10, pp. 1619–1628, 2021, doi: 10.1002/cite.202100048.
[45] T. Hanaoka, Y. Arao, Y. Kayaki, S. Kuwata, and M. Kubouchi, "Analysis of nitric acid decomposition of epoxy resin network structures for chemical recycling," Polymer Degradation and Stability, vol. 186, p. 109537, Apr. 2021, doi: 10.1016/j.polymdegradstab.2021.109537.
[46] M. J. Keith, G. A. Leeke, P. Khan, and A. Ingram, "Catalytic degradation of a carbon fibre reinforced polymer for recycling applications," Polymer Degradation and Stability, vol. 166, pp. 188–201, Aug. 2019, doi: 10.1016/j.polymdegradstab.2019.05.020.
[47] S. A. Walling, W. Um, C. L. Corkhill, and N. C. Hyatt, "Fenton and Fenton-like wet oxidation for degradation and destruction of organic radioactive wastes," npj Materials Degradation, vol. 5, no. 1, p. 50, Sep. 2021, doi: 10.1038/s41529-021-00192-3.
[48] Y. F. Khalil, "Sustainability assessment of solvolysis using supercritical fluids for carbon fiber reinforced polymers waste management," Sustainable Production and Consumption, vol. 17, pp. 74–84, Jan. 2019, doi: 10.1016/j.spc.2018.09.009.
[49] K. S. M. Nakagawa, "CFRP recycling technology using depolymerization under ordinary pressure," Resonac R&D Report, no. 56, vol. 6, Mar. 2014. [Online]. Available: https://www.resonac.com/sites/default/files/2022-12/en_pdf-rd-report-056-56_sou01.pdf. [Accessed: Jul. 10, 2026].
[50] M. Xing, Z. Li, G. Zheng, Y. Du, C. Chen, and Y. Wang, "Recycling of carbon fiber-reinforced epoxy resin composite via a novel acetic acid swelling technology," Composites Part B: Engineering, vol. 224, p. 109230, Nov. 2021, doi: 10.1016/j.compositesb.2021.109230.
[51] J. H. Kim, B. K. Song, K. J. Min, J. C. Choi, and H. S. Eun, "Optimizing Heat Treatment Conditions for Measuring CFRP and GFRP Resin Impregnation," Materials, vol. 15, no. 22, p. 8182, 2022, doi: 10.3390/ma15228182.
[52] T. Yang et al., "Oxidation Behavior of Carbon Fibers in Ceramizable Phenolic Resin Matrix Composites at Elevated Temperatures," Polymers, vol. 14, no. 14, p. 2785, Jul. 2022, doi: 10.3390/polym14142785.
[53] G. Kim, H. Lee, K. Kim, and D. U. Kim, "Effects of Heat Treatment Atmosphere and Temperature on the Properties of Carbon Fibers," Polymers, vol. 14, no. 12, p. 2412, Jun. 2022, doi: 10.3390/polym14122412.
[54] E. Harati Khalilabad, A. Ruiz Emparanza, F. De Caso, H. Roghani, N. Khodadadi, and A. Nanni, "Characterization Specifications for FRP Pultruded Materials: From Constituents to Pultruded Profiles," Fibers, vol. 11, no. 11, p. 93, 2023, doi: 10.3390/fib11110093.
[55] J. H. M. Stiller et al., "Combining Pultrusion with Carbonization: Process Analysis and Material Properties of CFRP and C/C," Ceramics, vol. 6, no. 1, pp. 330–341, 2023, doi: 10.3390/ceramics6010020.
[56] T. Liu, L. Shao, B. Zhao, Y.-C. Chang, and J. Zhang, "Progress in Chemical Recycling of Carbon Fiber Reinforced Epoxy Composites," Macromolecular Rapid Communications, vol. 43, no. 23, p. 2200538, Dec. 2022, doi: 10.1002/marc.202200538.