Abstract
The aim of this work was to create a biocomposite material with controllable electrical resistance for lightweight engineering made from regenerated cellulose-based fibers and a partially biobased epoxy resin. In this feasibility study viscose fabrics were coated with polypyrrole (PPy) by in situ polymerization of pyrrole (Py) and iron(III)-chloride as an oxidizing agent for the insertion of an electrical conductivity. Para-toluene sulfonic acid (pTSA) and 9,10-anthraquinone-2,6-disulfonic acid disodium salt (AQSA) were used as dopant agents to induce the conductivity. The treated viscose fabrics were incorporated into an epoxy matrix via vacuum infusion process and the resulting biocomposites were afterwards analyzed by electrical four-point measurement and three-point bending test. The surface of the coated fibers and the fracture surface after the bending test were analyzed via scanning electron microscopy (SEM). Through varying the pyrrole concentration between 3 and 6 g/l and the oxidizing/dopant agent ratio between 2:1 and 2:4, a significant reduction of electrical resistance was obtained. The lowest electrical resistance, 50 Ω/sq by the coated viscose fabrics and 7 Ω/sq by the corresponding biocomposites, was achieved by using the dopant/oxidizing ratio of 2:2. These results showed that the coating with pyrrole is a promising approach for the manufacture of electrically conductive biocomposite materials.
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Acknowledgements
This study was carried out in the scope of the project “Functionally-integrated, three-dimensional variable production of bio-hybrid components with maximum bio-based content (ProBio)”. We appreciate the financial support provided by the Ministry for Science and Culture of the State of Lower Saxony (MWK) for the implementation of this extensive project and especially this study. Additionally, the authors want to thank the workgroup of Prof. Bigall of the Institute of Physical Chemistry and Electrochemistry of the Leibniz Universität Hannover for the possibility for perform electrical resistance measurements.
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Vellguth, N., Shamsuyeva, M., Kroll, S. et al. Electrical conductivity in biocomposites via polypyrrole coating. J Mater Sci: Mater Electron 30, 2373–2381 (2019). https://doi.org/10.1007/s10854-018-0510-2
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DOI: https://doi.org/10.1007/s10854-018-0510-2