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Assessment of carbon fibers recovered from lab-scale versus pilot-scale mechanochemical CFRP depolymerization process based on fastrack thermal oxidation-resistance characteristics

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(4), pp.1085-1099
  • DOI : 10.1007/s42823-022-00343-9
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : December 13, 2021
  • Accepted : March 29, 2022
  • Published : June 1, 2022

Yan Caozheng 1 Njaramba Lewis Kamande 2 Nzioka Antony Mutua 3 Alunda Benard Ouma 4 myunggyun Kim 5 Sim Ye-Jin 3 Kim Young-Ju 6

1School of Economics and Management, Hubei University of Automotive Technology
2Department of Environmental Engineering, College of Engineering, Kyungpook National University
3R&D Institute, Silla Entech Co.
4Department of Mining and Mineral Processing, Taita Taveta University, P.O. Box, Voi, Kenya
5계명문화대학교
6Kyungpook National University

Accredited

ABSTRACT

This study assessed the changes in the fiber properties of virgin and recovered fibers from lab-scale and pilot-scale depolymerization reactors based on the thermal air oxidation-resistance characteristics. Lab-scale and pilot-scale depolymerization reactors had different depolymerization volumes. Results showed that the lab-scale and pilot-scale peak solvent temperatures were 185 °C and 151 °C, respectively. The lab-scale had highest solvent temperature rate increase because of the small depolymerization volume and the dominant role of the cavitation volume. The structural properties of the recovered and virgin fibers were intact even after the depolymerization and after the pretreatment and oxidation-resistance test. We observed 1.213%, 1.027% and 0.842% weight loss for the recovered (lab-scale), the recovered (pilot-scale) and virgin fibers because of the removal of impurities from the surface and chemisorbed gases. Further, we observed 0.8% mass loss of the recovered fibers (lab-scale) after the oxidative-onset temperature because of the “cavitation erosion effect” from the dominant of the cavitation bubbles. The “cavitation erosion effect” was subdued because of the increased depolymerization volume in the pilot-scale reactor. Therefore, negligible impact of the pilot-scale mechanochemical recycling process on the structure and surface characteristics of the fibers and the possibility of reusing the recovered fibers recycling process were characteristic. Representative functional groups were affected by the thermal oxidation process. We conducted HPLC, HT-XRD, TGA–DSC, XPS, SEM, and AFM analysis and provided an extensive discussion of the test thereof. This study highlighted how misleading and insufficient small-lab-scale results could be in developing viable CFRP depolymerization process.

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