Densified cellulose materials and delignified wood reinforced composites

Marion Frey, Livia Schneider, Meri Zirkelbach, Clemens Dransfeld, Kunal Masania, Tobias Keplinger, Ingo Burgert

Research output: Contribution to conferencePaperpeer-review

Abstract

The development of sustainable materials from renewable resources is one of the key challenges in today's materials science. Wood has great potential to play an important role in future materials advancement due to its excellent mechanical properties and high abundance. In this regard, two novel concepts for the development of high-performance wood-based materials in scalable top-down approaches are presented. Both concepts, Densified Cellulose Materials (DCMs) and Delignified Wood Reinforced Polymers (DWRPs), are based on delignification and densification of wood. Matrix free DCMs possess good tensile properties with a stiffness up to 40 GPa and strength up to 250 MPa. The high mechanical properties are obtained by a combination of high fibre volume content (FVC) of up to 80% and stress transfer throughout the cellulose scaffold enabled by mechanically interlocked fibre-fibre interfaces. Matrix infiltrated DWRPs reveal excellent tensile properties with elastic moduli of up to 70 GPa and 600 MPa strength. The epoxy matrix is vacuum infiltrated into the scaffold before densification and curing and provides an additional stiffening effect. The low intrinsic density of cellulose fibres results in attractive specific tensile properties, which are above previously reported values obtained for natural fibre composites such as flax or sisal. By scalable open-mold vacuum processing, DCMs with high tensile properties can be fabricated to partially replace less sustainable materials such as glass fibre reinforced composites in the future.

Original languageEnglish
Pages5229 - 5236
Publication statusPublished - 2019
Event22nd International Conference on Composite Materials, ICCM 2019 - Melbourne, Australia
Duration: 11 Aug 201916 Aug 2019

Conference

Conference22nd International Conference on Composite Materials, ICCM 2019
CountryAustralia
CityMelbourne
Period11/08/1916/08/19

Keywords

  • Cellulose fibre composite
  • Delignfied wood
  • Natural fibre composite
  • Open-mold processing
  • Vacuum infiltration

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