Delignification and Densification as a Route to Enable the Use of Wheat Straw for Structural Materials

Felix Neudecker, Matthias Jakob, Sabine Bodner, Jozef Keckes, Hermann Buerstmayr, Wolfgang Gindl-Altmutter

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


Cereal straw is an abundant byproduct of crop production. Despite little current use in materials, the biologically
optimized structure, which carries the weight of a structure up to 1.5 m high and protects it against environmental impacts, shows
considerable potential. In order to be able to use this renewable material for structural purposes, barriers such as small dimensions
and a low density have to be overcome. In the present study, lignin was partially removed from wheat straw using an alkaline solution
with the aim of increasing the relative cellulose content and improving malleability. Thereafter, a homogeneous, dense, and multi-
layered material was produced by densification at elevated temperatures. Outstanding improvements in mechanical performance
were obtained compared to the untreated raw material. For the optimum variant, tensile strength increased by a factor of three
(average strength 218 MPa) and elastic modulus increased by a factor of four (average 13 GPa), which is within the range of
established wood-based structural materials. We propose that mild alkaline treatment as carried out in the present study may
significantly facilitate the development of high-value structural materials based on little utilized cereal straw.
Seiten (von - bis)7596-7604
FachzeitschriftACS Sustainable Chemistry and Engineering
PublikationsstatusVeröffentlicht - 4 Mai 2023

Bibliographische Notiz

Funding Information:
The authors are thankful for financial support for the project “Upgrading agro-residues to versatile high value materials” funded by NÖ Forschungs-und Bildungsges.m.b.H. (NFB), Neue Herrengasse 10, 3. Stock, 3100 St. Pölten, Austria. We also thank Ivana Czabany for her expertise and assistance during the laboratory work.

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

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