Fiber formation and properties of polyester/lignin blends |
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| Authors: | Doris Pospiech Andreas Korwitz Kathrin Eckstein Hartmut Komber Dieter Jehnichen Marcus Suckow Albena Lederer Kerstin Arnhold Michael Göbel Martina Bremer Anton Hoffmann Steffen Fischer Anett Werner Thomas Walther Harald Brünig Brigitte Voit |
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| Affiliation: | 1. Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Str. 6, 01069 Dresden, Germany;2. Technische Universität Dresden, Wood and Plant Chemistry, Pienner Str. 19, 01737 Tharandt, Germany;3. Technische Universität Dresden, Institute of Natural Materials Technology, ZINT, Berg Str. 120, 01069 Dresden, Germany |
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| Abstract: | Thermotropic liquid crystalline polyesters with varied chemical structure are synthesized by melt transesterification polycondensation. They are employed as matrix for blends with lignin materials to obtain melt-spinnable precursors for carbon fibers. The lignin samples are carefully purified by fractionation, enzymatic removal of reducing sugars, and subsequent modification of the terminal OH groups. Effective melt blending is achieved with liquid-crystalline aromatic–aliphatic polyesters having melting ranges that match the softening temperature of the lignin fractions, which is necessary to prevent thermal decomposition of the lignin. Polyester/lignin blends are partially compatibilized, phase-separated materials. The polyester/lignin materials are melt-spun successfully. The fiber properties depend on the lignin purification process. X-ray scattering reveals that orientation in lignin-containing fibers is maintained. First experiments show that the fibers can be converted successfully to carbon fibers by thermal annealing procedures. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48257. |
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| Keywords: | extrusion lignin mechanical properties polyester thermal properties |
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