Solid‐state NMR study of spin finish of thermally treated PAN and PAN/CNT precursor fibers |
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| Authors: | Sushanta Ghoshal Yaodong Liu Prabhakar Gulgunje Kishor Gupta Han Gi Chae Johannes Leisen Satish Kumar |
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| Affiliation: | 1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia;2. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia |
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| Abstract: | Dry‐jet wet‐spun polyacrylonitrile (PAN) and PAN/carbon nanotubes (CNTs) precursor fibers coated by spin finishes were characterized using the solid‐state 1H nuclear magnetic resonance technique. Series of fiber samples were prepared upon thermal treatment at different temperatures (room temperature to 180°C). Using the Hahn echo sequence, relatively mobile components were identified and the effect of the heat treatment on those components was studied. It was observed that the mobile components are mainly the spin finishes. Heat treatment caused loss of one of the spin finishes (Type B) to a great extent (～80%), whereas the other two spin finishes (Type A and Type C) were more stable. Additional information regarding the change in molecular mobility due to heat treatment was obtained by the spin‐lattice relaxation time ( T1 ) analysis. It was found that the presence of CNT affects the T1 relaxation time of the polymer in the composite fiber, however, that of relatively mobile components remains unaffected. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40734. |
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| Keywords: | fibers nanotubes spectroscopy textiles |
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