Cellulose is the most abundant biopolymer and its products such as paper, tissue, and paper board are a necessity for our daily life. With the biobased industrial sector gaining importance, the demand is going to increase further.<br/>However, a lot of the influencing parameters on the final product’s mechanical properties are unknown. Especially figuring out the interplay between the single fiber and the fiber network level is challenging. One reason is that single fibers are complicated to investigate. They exhibit a complex hierarchical structure and have anisotropic properties which depend on moisture content. Here, Brillouin light scattering (BLS) spectroscopy as a technique which enables the measurement of elastic properties of single cellulosic fibers in a non-contact manner is promising. Using laser light to probe phonons in different directions (see figure) enables the determination of the elastic constants. In this talk, first BLS results from different cellulosic fibers will be presented and discussed in comparison to mechanical properties obtained by micromechanical techniques like nanoindentation and tensile testing.

Micromechanics of lignocellulosic fibers

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