Indicators for evaluation of progress in thermal stabilization reactions of polyacrylonitrile fibers |
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| Authors: | Shahram Arbab Hamideh Mirbaha Ahmad Zeinolebadi Parviz Nourpanah |
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| Affiliation: | 1. Department of Textile Engineering, ATMT Research Institute, Amirkabir University of Technology, Tehran, Iran;2. Department of Textile Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran;3. Department of Chemistry, Institute of Technical and Macromolecular Chemistry, University of Hamburg, Hamburg, Germany;4. Department of Textile Engineering, Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | Using different indices calculated from Fourier Transform Infrared Spectroscopy (FTIR), X‐ray Diffraction (XRD), and Differential Scanning Calorimetry (DSC) spectra, progress in stabilization reactions of three different commercial grade polyacrylonitrile (PAN) fibers is calculated. From each analysis technique quantitative indices are computed which could assess in some particular reactions. Combination of these indices gives further information about the progress of stabilization reactions which cannot be concluded from single indices. The results show that different indices are not fully consistent with each other, depending on the analysis technique and the changes they assess. The advantages and disadvantages of each index are investigated and practical indices are identified which can be used to design the optimum stabilization process. In addition, by combination of some indices it is possible to separate the temperature ranges in which reactions occur in amorphous or crystalline regions. This approach can be used to design appropriate stretching process during stabilization. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40343. |
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| Keywords: | polyacrylonitrile thermal stabilization stabilization index FT‐IR XRD DSC |
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