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The effect of a superhydrophobic coating on moisture absorption and tensile strength of 3D-printed carbon-fibre/polyamide

Kreider, Peter and Cardew-Hall, Andrew and Sommacal, Silvano and Chadwick, Ashley and Hümbert, Simon and Nowotny, Sebastian and Nisbet, David and Tricoli, Antonio and Compston, Paul (2021) The effect of a superhydrophobic coating on moisture absorption and tensile strength of 3D-printed carbon-fibre/polyamide. Composites Part A: Applied Science and Manufacturing, 145. Elsevier. doi: 10.1016/j.compositesa.2021.106380. ISSN 1359-835X.

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This work investigates the effectiveness of fluorinated silica-based superhydrophobic coatings to protect 3Dprinted carbon-fibre/polyamide composites against moisture-induced degradation. Increasing exposure time in wet and humid environments led to a reduction of tensile strength and an increase in experienced strain. However, the coated PA demonstrated 6.7-12.4% higher tensile yield strength than the uncoated PA. Highresolution X-ray micro computed tomography (uCT) was used to image the microstructure and revealed that the superhydrophobic coating effectively prevented liquid water penetration into 3D-printed polyamide and delayed water vapour-driven mechanical degradation. The presence of the superhydrophobic coating eliminated the liquid water presence in the surface features of the PA matrix and reduced the moisture-induced swelling of the polyamide matrix by about 53% after 168 h under water. Further optimisation of these coatings may provide a solution to enhance the performance of PA composites in humid and wet environments.

Item URL in elib:https://elib.dlr.de/144919/
Document Type:Article
Title:The effect of a superhydrophobic coating on moisture absorption and tensile strength of 3D-printed carbon-fibre/polyamide
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kreider, Peterpeter.kreider (at) anu.edu.auUNSPECIFIED
Cardew-Hall, Andrewa.cardewhall (at) gmail.comUNSPECIFIED
Sommacal, SilvanoSilvano.Sommacal (at) anu.edu.auUNSPECIFIED
Chadwick, AshleyAshley.Chadwick (at) dlr.dehttps://orcid.org/0000-0001-7693-5687
Hümbert, Simonsimon.huembert (at) dlr.deUNSPECIFIED
Nowotny, SebastianSebastian.Nowotny (at) dlr.dehttps://orcid.org/0000-0002-5333-953X
Nisbet, Daviddavid.nisbet (at) anu.edu.auUNSPECIFIED
Tricoli, Antonioantonio.tricoli (at) anu.edu.auUNSPECIFIED
Compston, Paulpaul.compston (at) anu.edu.auUNSPECIFIED
Date:June 2021
Journal or Publication Title:Composites Part A: Applied Science and Manufacturing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.compositesa.2021.106380
Keywords:Polymer-matrix composites (PMCs), Environmental degradation, Surface properties, CT analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Design and Manufacture Technologies
Deposited By: Nowotny, Sebastian
Deposited On:27 Oct 2021 12:27
Last Modified:27 Oct 2021 12:27

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