Regensburg 2019 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 21: Biopolymers, biomaterials and bioinspired functional materials (joint session CPP/BP)
BP 21.5: Vortrag
Mittwoch, 3. April 2019, 17:15–17:30, H13
Transverse viscoelastic properties of cellulose fibers investigated by atomic force microscopy — •Caterina Czibula1,3, Christian Ganser1,3, Ulrich Hirn2,3, and Christian Teichert1,3 — 1Institute of Physics, Montanuniversitaet Leoben, Austria — 2Institute of Paper, Pulp and Fibre Technology, Graz University of Technology, Austria — 3CD Laboratory for Fiber Swelling and Paper Performance, Graz University of Technology, Austria
Cellulosic fibers are used in the paper and textile industry. To gain more insight on how mechanical properties of cellulose fibers are related to properties of end-products like paper, our work focusses on the transverse viscoelastic behavior of single cellulose fibers. To reach this ambitious goal we implemented an atomic force microscopy (AFM) based method. Probing nanoscale mechanical properties of soft materials with AFM yields information on the performance of the material. With the Johnson-Kendall-Roberts model, the contact between AFM tip and sample surface can be well described. The evaluation of the experimental data combines contact mechanics and viscoelastic models which consist of springs and dashpots in series or parallel describing elastic and viscous behavior, respectively. Here, it will be demonstrated that the so-called Generalized Maxwell model yields reasonable results for single pulp as well as viscose fibers at five different relative humidity (RH) values and in water. The RH increase leads to a steady decrease of the viscoelastic properties. Especially in water, the viscoelastic behavior shows a pronounced decrease, proving that the interaction of the fibers in water is different than at varying RH levels.