期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 29, 页码 9638-9646出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c08373
关键词
delignified wood; natural fiber composite; all bio-based material; starch adhesive; cellulose
资金
- Innosuisse
- AKA
- Business Finland
- Vinnova
- BMLFUW
- European Union's Horizon 2020 research and innovation program [773324]
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [754364]
This study combines delignified wood layers and starch-based glue into high-performance bio-based composites, achieving fiber volume contents of up to 80% and producing laminates with high strength and stiffness through wet processing.
The need for renewable bio-based materials that could replace well-established synthetic composite materials is rapidly growing. For example, bio-based materials are increasingly used in applications where a lightweight design should be combined with sustainability and recyclability. However, it is often very challenging to directly transfer the excellent properties of biological materials to a product in a scalable and cost-efficient manner. In this study, we combined delignified wood layers (veneers) and a starch-based glue into bio-based high-performance composites. First, we investigated the ideal amount of starch-based glue between the layers to prevent delamination in the final composite. Then, we produced laminates in unidirectional, cross-ply, and quasi-isotropic configurations using wet processing. Laminates with tensile properties up to 40 GPa and 200 MPa in tensile stiffness and strength, respectively, were fabricated with a very high fiber volume content of up to 80%. The high fiber volume contents led to mechanical interlocks between neighboring fibers and made the need for an additional matrix unnecessary. The water-based laminate process is cost-efficient and scalable and additionally allows one to make full use of delignified wood's formability by producing shaped parts for various applications.
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