Sensitivity of offline and inline indicators for fiber stretching in continuous polyacrylonitrile stabilization
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
In carbon fiber (CF) production, the stabilization process step is the most energy- and time-consuming step in comparison with carbonization and graphitization. To develop optimization routes for energy and productivity, the stabilization needs to be monitored continuously via inline analysis methods. To prognose the evolution of high-performance CF, the density of stabilized fibers has been identified as a robust pre-indicator. As the offline analysis of density is not feasible for inline analysis, a density-soft sensor based on the stabilization indices of Fourier Transform Infrared spectrum (FTIR)-analysis and Electron Paramagnetic Resonance (EPR) Spectroscopy could potentially be used for inline monitoring. In this study, a Polyacrylonitrile-based precursor fiber (PF) stabilized in a continuous thermomechanical stabilization line with varying stretching profiles was incrementally analyzed using density, FTIR-based relative cyclization index (RCI), and EPR-based free radical concentration (FRC). Our findings show RCI and EPR dependencies for density, correlated for RCI with sensitivity by stretching to cubic model parameters, while FRC exhibits linear relationships. Therefore, this study identifies two possible soft sensors for inline density measurement, enabling autonomous energy optimization within industry 4.0-based process systems.
Details
Original language | English |
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Article number | 68 |
Number of pages | 17 |
Journal | Fibers |
Volume | 11 |
Issue number | 8 |
Publication status | Published - 4 Aug 2023 |
Peer-reviewed | Yes |
External IDs
Scopus | 85169077877 |
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Mendeley | 83cd10d4-fd61-30ad-be85-aefd53125241 |
ORCID | /0000-0003-1370-064X/work/142243867 |
WOS | 001057131500001 |
Keywords
Research priority areas of TU Dresden
DFG Classification of Subject Areas according to Review Boards
Subject groups, research areas, subject areas according to Destatis
Sustainable Development Goals
ASJC Scopus subject areas
Keywords
- carbon fiber, polyacrylonitrile, cyclization, density, free radical concentration, stabilization