Marion Frey

Last Name

Frey

First Name

Marion

ORCID

0000-0002-9242-4331

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Publications1 - 8 of 8

Delignified Wood-Polymer Interpenetrating Composites Exceeding the Rule of Mixtures
Frey, Marion; Schneider, L.; Masania, Kunal; et al. (2019)
ACS Applied Materials & Interfaces
Fabrication and Design of Wood-Based High-Performance Composites
Frey, Marion; Zirkelbach, Meri; Dransfeld, Clemens; et al. (2019)
Journal of Visualized Experiments. JoVE
Delignified densified wood is a new promising and sustainable material that possesses the potential to replace synthetic materials, such as glass fiber reinforced composites, due to its excellent mechanical properties. Delignified wood, however, is rather fragile in a wet state, which makes handling and shaping challenging. Here we present two fabrication processes, closed-mold densification and vacuum densification, to produce high-performance cellulose composites based on delignified wood, including an assessment of their advantages and limitations. Further, we suggest strategies for how the composites can be re-used or decomposed at the end-of-life cycle. Closed-mold densification has the advantage that no elaborate lab equipment is needed. Simple screw clamps or a press can be used for densification. We recommend this method for small parts with simple geometries and large radii of curvature. Vacuum densification in an open-mold process is suitable for larger objects and complex geometries, including small radii of curvature. Compared to the closed-mold process, the open-mold vacuum approach only needs the manufacture of a single mold cavity.
High-Performance All-Bio-Based Laminates Derived from Delignified Wood
Frey, Marion; Schneider, Livia; Razi, Hajar; et al. (2021)
ACS Sustainable Chemistry & Engineering
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.
Mesoporosity of Delignified Wood Investigated by Water Vapor Sorption
Grönquist, Philippe; Frey, Marion; Keplinger, Tobias; et al. (2019)
ACS Omega
Wood represents a highly suitable biobased scaffold for the development of mechanically robust and functional materials. Its functionalizability can be enhanced by means of delignification, resulting in an increase in porosity due to partial or complete removal of lignin and hemicellulose constituents. In this work, the impact of partial and complete delignification on the mesoporous structure is investigated via water vapor sorption isotherms and deuterium exchange. Pore size distributions of wood samples with five different delignification levels were compared to native wood. The derived pore size distributions at the water swollen state reveal an increase in porosity with decreasing lignin content. However, after complete lignin removal, drying causes a nonreversible collapse of the cell wall, which results in reduced porosity.
Tunable wood by reversible interlocking and bioinspired mechanical gradients
Frey, Marion; Biffi, Giulia; Adobes Vidal, Maria; et al. (2019)
Advanced Science
Elegant design principles in biological materials such as stiffness gradients or sophisticated interfaces provide ingenious solutions for an efficient improvement of their mechanical properties. When materials such as wood are directly used in high‐performance applications, it is not possible to entirely profit from these optimizations because stiffness alterations and fiber alignment of the natural material are not designed for the desired application. In this work, wood is turned into a versatile engineering material by incorporating mechanical gradients and by locally adapting the fiber alignment, using a shaping mechanism enabled by reversible interlocks between wood cells. Delignification of the renewable resource wood, a subsequent topographic stacking of the cellulosic scaffolds, and a final densification allow fabrication of desired 3D shapes with tunable fiber architecture. Additionally, prior functionalization of the cellulose scaffolds allows for obtaining tunable functionality combined with mechanical gradients. Locally controllable elastic moduli between 5 and 35 GPa are obtained, inspired by the ability of trees to tailor their macro‐ and micro‐structure. The versatility of this approach has significant relevance in the emerging field of high‐performance materials from renewable resources.
Liquid‐Like SiO2‐g‐PDMS Coatings on Wood Surfaces with Underwater Durability, Antifouling, Antismudge, and Self‐Healing Properties
Wang, Yaru; Yan, Wenqing; Frey, Marion; et al. (2019)
Advanced Sustainable Systems
Versatile Strategies for the Development of Wood-Based Functional Materials
Keplinger, Tobias; Frey, Marion; Burgert, Ingo (2018)
Proceedings of SPIE ~ Bioinspiration, Biomimetics, and Bioreplication VIII
Adhesives free bark panels: An alternative application for a waste material
Wenig, Charlett; Reppe, Friedrich; Horbelt, Nils; et al. (2023)
PLoS ONE
The proportion of bark in tree trunks is in the range of ~ 10–20%. This large amount of material is currently mainly considered as a by- or even waste-product by the timber processing industry. Recently, efforts towards the use of bark have been made, e.g. as a raw material to harvest different chemical compounds or as an additive for wood particle boards. Our motivation for this work was to keep the bark in an almost natural state and explore alternative processes and applications for use. The traditional method of de-barking tree trunks by peeling was used to harvest large bark pieces. Two pieces of peeled bark were placed crosswise, with the rhytidom side (outer bark) facing each other. After different conditioning steps, bark pieces were hot pressed to panels without adding adhesives. These experiments on bark samples of different Central European tree species suggest that production of panels with species dependent properties is possible and feasible. This is a step towards producing sustainable panels by using a natural waste material, while retaining its beneficial structure and its natural chemical composition.

Publications1 - 8 of 8

Marion Frey

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