Structures and cyclization behaviors of gel-spun cellulose/polyacrylonitrile composite fibers |
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Affiliation: | 1. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, D-01069 Dresden, Germany;2. Institute of Lightweight Engineering and Polymer Technology, Technische Universität Dresden, D-01307 Dresden, Germany;3. Institute of Textile Machinery and High Performance Material Technology, Technische Universität Dresden, D-1069 Dresden, Germany;4. Research Center Carbon Fibers Saxony (RCCF), Technische Universität Dresden, D-1069 Dresden, Germany |
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Abstract: | Polyacrylonitrile (PAN)/cellulose composite fibers have been produced by dry-jet gel spinning through their co-solution. The rheological properties of PAN/cellulose/dimethylacetamide/LiCl solutions containing different cellulose contents from 0 to 10 wt% were characterized, and 5 wt% PAN/cellulose composite solution shows the best solution homogeneity. During gel spinning, the cellulose forms elongated particles inside the gelation bath, and the particle diameters depend on the as-spun draw ratio. It was found that the glass transition of PAN fibers shifts to higher temperatures along with the increase of cellulose content, and the glass transition activation energy of PAN chains becomes higher when cellulose particles become smaller. Regardless the changes of cellulose amount (2–10 wt%) and particle diameter (7.1–1.4 μm), the cyclization activation energy of PAN/cellulose composite fibers is 13–17% lower than that of neat PAN fibers. Our experiments suggest that the addition of cellulose in PAN fibers has no direct effect on the cyclization reaction of PAN chains. Instead, the released by-products during the pyrolysis of cellulose at high temperature degradation affect the cyclization reaction of PAN chains. |
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Keywords: | Cellulose Polyacrylonitrile Gel spinning Composite fiber Cyclization |
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