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Stability of encapsulated electrical interconnections coated on fabric exposed to mechanical strain.
University of Borås, Faculty of Caring Science, Work Life and Social Welfare. University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-6995-967X
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-4369-9304
(English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069Article in journal (Refereed) Submitted
Abstract [en]

In this study, two different conductive coating formulation containing silver (Ag) and silver-coated copper (Cu) flakes are studied to evaluate the electromechanical stabilityof encapsulated conductors coated on textiles in a multilayer construction. Consideringe-textiles as a possible application area with integrated conductors functioning as interconnections, the purpose is to obtain a fundamental understanding of the deformation behaviour when subjected to tensile and compressive strains during bending. The results show that an increased Ag conductor thickness with flakes <5 μm was a favourable combination regardless of encapsulation thickness providing samples with minimal stress responses upon bending deformations at angles of -180°, -90°, 90°and 180°, and, sheet resistance (Rsh) values of 0.01 Ω/sq. It was shown that the conductor layer changed shape depending on the bending angle resulting in alternating convex and concave arcs at -180° and a more uniform curvature at 180°. The findings were correlated to lower and larger Rsh ratios, respectively, which are denoted as the thinner encapsulated Ag conductors and the Cu conductors of different thicknesses, respectively. Up to ten repetitive bendings at angles between -180° and 180° did however induce stresses within the material resulting in an increased Rsh by a factor of>10.

Keyword [en]
Electrically conductive textiles, interconnections, coatings, encapsulated, mechanical stability
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hb:diva-13943OAI: oai:DiVA.org:hb-13943DiVA, id: diva2:1195125
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-04
In thesis
1. Functional Textile Coatings Containing Flake-shaped Fillers: investigations on selected optical and electrical properties
Open this publication in new window or tab >>Functional Textile Coatings Containing Flake-shaped Fillers: investigations on selected optical and electrical properties
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates the manufacturing and characterisation of functionalised textile coatings containing different types of flake-shaped fillers with angle-dependent colour-changing and electrically conductive properties, respectively. Common benefits of these types of flakes are their high aspect ratio, which offers low filler loading with high functional performance. However, when applied on flexible fabric, their impact on the mechanical properties and durability leads to that a trade-off between, for example, flexural rigidity and functional performance need to be taken into account. Both experimental studies, with different functional approaches, explore how formulation additives e.g. rheology modifiers and cross-linker and knife coating parameters e.g. gap height and speed influence the formulation viscosity, which in turn strongly influences the amount of solids deposited on the fabric, and the functional performance.

Multilayered mica pigments can provide an angle-dependent colour change based on the phenomenon of interference, and has great potential in application within the textile design and product authentication fields. However, optimal conditions for intense colour-changing effects using these types of flake-shaped pigments depend on a plane-parallel orientation to a flat substrate. The pigment orientation is challenged by textile substrates, which have a textured surface due to the cross-sectional shape of the fibre, the yarn composition and fabric construction. In addition, the semi-transparent nature of these types of pigments means that the substrate colour highly influences the colour-changing effects.

Metal flake-shaped fillers for high electrical conductivity applications are particularly advantageous for reliable power and signal transferring interconnections in the field of electronic textiles. As the conductivity depends on the electron transport between the metal flakes, the challenge is to establish and maintain the three-dimensional network of contacting surfaces between flakes. Although the network is held together and adhered to the substrate by an insulating polymer film matrix, it is highly sensitive to dimensional impact upon different

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2018. p. 69
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 87
Keyword
Flakes, fillers, textile coating, properties, multilayered mica, effect pigment, angle-dependent colour change, metals, conductivity, resistance measurements, e-textiles, flexibility, durability
National Category
Engineering and Technology
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-13691 (URN)978-91-88269-90-4 (ISBN)978-91-88269-91-1 (ISBN)
Public defence
2018-04-27, Vestindien C, Textile Fashion Centre, Skaraborgsvägen 3, Borås, 10:00
Opponent
Available from: 2018-04-04 Created: 2018-02-19 Last updated: 2018-04-10Bibliographically approved

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Malm, VeronicaSeoane, FernandoNierstrasz, Vincent

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