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<p>The increasing use of carbon fiber reinforced plastics (CFRP) in high value-added industries has made the development of recycled CFRP (rCFRP) crucial for sustainable manufacturing. However, there are few studies on the temperature-dependent mechanical behavior of rCFRP. This knowledge gap limits its application in automotive or aerospace industries where components maintain structural integrity across varying thermal conditions. This study systematically investigated the mechanical properties of injection-molded rCFRP at elevated temperatures. Carbon fiber was recovered from end-of-life CFRP waste through chemical oxidative recycling, and SEM and Raman spectroscopy confirmed minimal surface degradation during the recycling process, with the recovered fiber retaining 90% of virgin fiber tensile strength (4.35 GPa) and modulus (262.12 GPa). The recovered carbon fibers were compounded with polycarbonate (PC) via twin-screw extrusion for injection molding. The incorporation of 20 wt% recycled carbon fiber (rCF) significantly enhanced both tensile strength (73% increase to 100.17&#xa0;MPa) and flexural strength (75% increase to 163.1&#xa0;MPa) compared to neat PC. To evaluate performance in operating conditions at elevated temperatures (100&#xa0;°C), the rCF/PC composites maintained 63.8% of room temperature tensile strength and 85.4% of tensile modulus. Fracture morphology analysis revealed effective interfacial bonding at room temperature. At elevated temperatures, the difference in the thermal expansion coefficient between rCF and PC induced interfacial degradation, though the strength enhancement remained valid. To demonstrate practical applicability, automotive components were successfully fabricated through injection molding using rCF/PC composites. This comprehensive investigation of temperature-dependent rCFRP properties advances composite technology for sustainable manufacturing in thermally demanding applications. </p>

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Temperature Dependent Mechanical Properties of End-of-Life Carbon Fiber Reinforced Plastics

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Sangjun Jeon,
  • Jungyeom Kim,
  • Seong Je Park,
  • Jun Young Kim,
  • Seung Ki Moon,
  • Daejong Yang

摘要

The increasing use of carbon fiber reinforced plastics (CFRP) in high value-added industries has made the development of recycled CFRP (rCFRP) crucial for sustainable manufacturing. However, there are few studies on the temperature-dependent mechanical behavior of rCFRP. This knowledge gap limits its application in automotive or aerospace industries where components maintain structural integrity across varying thermal conditions. This study systematically investigated the mechanical properties of injection-molded rCFRP at elevated temperatures. Carbon fiber was recovered from end-of-life CFRP waste through chemical oxidative recycling, and SEM and Raman spectroscopy confirmed minimal surface degradation during the recycling process, with the recovered fiber retaining 90% of virgin fiber tensile strength (4.35 GPa) and modulus (262.12 GPa). The recovered carbon fibers were compounded with polycarbonate (PC) via twin-screw extrusion for injection molding. The incorporation of 20 wt% recycled carbon fiber (rCF) significantly enhanced both tensile strength (73% increase to 100.17 MPa) and flexural strength (75% increase to 163.1 MPa) compared to neat PC. To evaluate performance in operating conditions at elevated temperatures (100 °C), the rCF/PC composites maintained 63.8% of room temperature tensile strength and 85.4% of tensile modulus. Fracture morphology analysis revealed effective interfacial bonding at room temperature. At elevated temperatures, the difference in the thermal expansion coefficient between rCF and PC induced interfacial degradation, though the strength enhancement remained valid. To demonstrate practical applicability, automotive components were successfully fabricated through injection molding using rCF/PC composites. This comprehensive investigation of temperature-dependent rCFRP properties advances composite technology for sustainable manufacturing in thermally demanding applications.