Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites
Natural fibres have a high potential as reinforcement of polymer matrices, as they combine a high specific strength and modulus with sustainable production and reasonable prices. Modifying the fibre surface is a common method to increase the adhesion and thereby enhance the mechanical properties of...
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doaj-801bd984c008443eb6e727f60d4141a02020-11-25T03:37:34ZengMDPI AGMaterials1996-19442020-10-01134529452910.3390/ma13204529Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy CompositesHanna M. Brodowsky0Anne Hennig1Michael Thomas Müller2Anett Werner3Serge Zhandarov4Uwe Gohs5HTWK, Leipzig University of Applied Sciences, D-04277 Leipzig, GermanyFormerly Leibniz Institute of Polymer Research (IPF), D-01069 Dresden, GermanyLeibniz Institute of Polymer Research (IPF), D-01069 Dresden, GermanyBioprocess Engineering, Institute of Natural Materials Technology, Faculty of Mechanical Science and Engineering, Technical University Dresden, D-01069 Dresden, GermanyV.A. Bely Metal-Polymer Research Institute of the National Academy of Sciences of Belarus, 246050 Gomel, BelarusInstitute of Lightweight Engineering and Polymer Technology, Faculty of Mechanical Science and Engineering, Technical University Dresden, D-01307 Dresden, GermanyNatural fibres have a high potential as reinforcement of polymer matrices, as they combine a high specific strength and modulus with sustainable production and reasonable prices. Modifying the fibre surface is a common method to increase the adhesion and thereby enhance the mechanical properties of composites. In this study, a novel sustainable surface treatment is presented: the fungal enzyme laccase was utilised with the aim of covalently binding the coupling agent dopamine to flax fibre surfaces. The goal is to improve the interfacial strength towards an epoxy matrix. SEM and AFM micrographs showed that the modification changes the surface morphology, indicating a deposition of dopamine on the surface. Fibre tensile tests, which were performed to check whether the fibre structure was damaged during the treatment, showed that no decrease in tensile strength or modulus occurred. Single fibre pullout tests showed a 30% increase in interfacial shear strength (IFSS) due to the laccase-mediated bonding of the coupling agent dopamine. These results demonstrate that a laccase + dopamine treatment modifies flax fibres sustainably and increases the interfacial strength towards epoxy.https://www.mdpi.com/1996-1944/13/20/4529natural fibre compositesenzymelaccasedopamineinterphase |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hanna M. Brodowsky Anne Hennig Michael Thomas Müller Anett Werner Serge Zhandarov Uwe Gohs |
spellingShingle |
Hanna M. Brodowsky Anne Hennig Michael Thomas Müller Anett Werner Serge Zhandarov Uwe Gohs Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites Materials natural fibre composites enzyme laccase dopamine interphase |
author_facet |
Hanna M. Brodowsky Anne Hennig Michael Thomas Müller Anett Werner Serge Zhandarov Uwe Gohs |
author_sort |
Hanna M. Brodowsky |
title |
Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites |
title_short |
Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites |
title_full |
Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites |
title_fullStr |
Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites |
title_full_unstemmed |
Laccase-Enzyme Treated Flax Fibre for Use in Natural Fibre Epoxy Composites |
title_sort |
laccase-enzyme treated flax fibre for use in natural fibre epoxy composites |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-10-01 |
description |
Natural fibres have a high potential as reinforcement of polymer matrices, as they combine a high specific strength and modulus with sustainable production and reasonable prices. Modifying the fibre surface is a common method to increase the adhesion and thereby enhance the mechanical properties of composites. In this study, a novel sustainable surface treatment is presented: the fungal enzyme laccase was utilised with the aim of covalently binding the coupling agent dopamine to flax fibre surfaces. The goal is to improve the interfacial strength towards an epoxy matrix. SEM and AFM micrographs showed that the modification changes the surface morphology, indicating a deposition of dopamine on the surface. Fibre tensile tests, which were performed to check whether the fibre structure was damaged during the treatment, showed that no decrease in tensile strength or modulus occurred. Single fibre pullout tests showed a 30% increase in interfacial shear strength (IFSS) due to the laccase-mediated bonding of the coupling agent dopamine. These results demonstrate that a laccase + dopamine treatment modifies flax fibres sustainably and increases the interfacial strength towards epoxy. |
topic |
natural fibre composites enzyme laccase dopamine interphase |
url |
https://www.mdpi.com/1996-1944/13/20/4529 |
work_keys_str_mv |
AT hannambrodowsky laccaseenzymetreatedflaxfibreforuseinnaturalfibreepoxycomposites AT annehennig laccaseenzymetreatedflaxfibreforuseinnaturalfibreepoxycomposites AT michaelthomasmuller laccaseenzymetreatedflaxfibreforuseinnaturalfibreepoxycomposites AT anettwerner laccaseenzymetreatedflaxfibreforuseinnaturalfibreepoxycomposites AT sergezhandarov laccaseenzymetreatedflaxfibreforuseinnaturalfibreepoxycomposites AT uwegohs laccaseenzymetreatedflaxfibreforuseinnaturalfibreepoxycomposites |
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