Disassociated molecular orientation distributions of a composite cellulose-lignin carbon fiber precursor: A study by rotor synchronized NMR spectroscopy and X-ray scattering

Leo Svenningsson, Jenny Bengtsson, Kerstin Jedvert, Werner Schlemmer, Hans Theliander, Lars Eväns*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Cellulose-lignin composite carbon fibers have shown to be a potential environmentally benign alternative to the traditional polyacrylonitrile precursor. With the associated cost reduction, cellulose-lignin carbon fibers are an attractive light-weight material for e.g. wind power and automobile manufacturing. The carbon fiber tenacity, tensile modulus and creep resistance is in part determined by the carbon content and the molecular orientation distribution of the precursor. This work disassociates the molecular orientation of different components in cellulose-lignin composite fibers using rotor-synchronized solid-state nuclear magnetic resonance spectroscopy and X-ray scattering. Our results show that lignin is completely disordered, in a mechanically stretched cellulose-lignin composite fiber, while the cellulose is ordered. In contrast, the native spruce wood raw material displays both oriented lignin and cellulose. The current processes for fabricating a cellulose-lignin composite fiber can not regain the oriented lignin as observed from the native wood
Original languageEnglish
Article number117293
Number of pages22
JournalCarbohydrate Polymers
DOIs
Publication statusE-pub ahead of print - 2020

Keywords

  • Carbon fiber
  • Rotor Synchronized NMR
  • Molecular Orientation

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