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Single step PAA delignification of wood chips for high-performance holocellulose fibers

Abstract

Holocellulose fibers produced by mild delignification form strong fiber networks, without beating or dry-strength agents. Recently, sequential batch delignification using peracetic acid (PAA) on finely cut wood sticks resulted in high-quality holocellulose fibers. Here, single step PAA delignification is developed for wood chips, which is simpler and can be used for larger fiber batches (400 g) with similar, high yield (60%). Such fibers have 1.4% lignin, 25% hemicelluloses content and well-preserved cellulose and hemicellulose molar mass. The corresponding paper sheet materials with a porosity of ~ 50%, have a Young’s modulus of 9 GPa and a strength of 90 MPa. Holocellulose fibers can now be readily investigated for use in larger scale paper, molded fiber and polymer biocomposite materials applications, or for cellulose nanofibril preparation.

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Acknowledgments

This research is supported by the Kempe Foundation. X.Y. and L. A. B. acknowledge funding from the Knut and Alice Wallenberg foundation for the Biocomposites project. Jonas Garemark is acknowledged for contributing work to Fig. 1.

Funding

This research is supported by the Kempe Foundation. X.Y. and L. A. B. acknowledge funding with Grant number JCK 1835 from the Knut and Alice Wallenberg foundation with Grant number KAW 2018.0451 for the Biocomposites project.

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Correspondence to Hans Grundberg or Lars A. Berglund.

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Westin, PO., Yang, X., Svedberg, A. et al. Single step PAA delignification of wood chips for high-performance holocellulose fibers. Cellulose 28, 1873–1880 (2021). https://doi.org/10.1007/s10570-020-03625-5

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  • DOI: https://doi.org/10.1007/s10570-020-03625-5

Keywords

  • Paper
  • Holocellulose
  • Delignification
  • Molded fibers
  • Mechanical properties
  • Wood pulp
  • Pulping process