Electrically Conducting Elastomeric Fibers with High Stretchability and Stability
Journal article, 2022

Stretchable conducting materials are appealing for the design of unobtrusive wearable electronic devices. Conjugated polymers with oligoethylene glycol side chains are excellent candidate materials owing to their low elastic modulus and good compatibility with polar stretchable polymers. Here, electrically conducting elastomeric blend fibers with high stretchability, wet spun from a blend of a doped polar polythiophene with tetraethylene glycol side chains and a polyurethane are reported. The wet-spinning process is versatile, reproducible, scalable, and produces continuous filaments with a diameter ranging from 30 to 70 µm. The fibers are stretchable up to 480% even after chemical doping with iron(III) p-toluenesulfonate hexahydrate and exhibit an electrical conductivity of up to 7.4 S cm−1, which represents a record combination of properties for conjugated polymer-based fibers. The fibers remain conductive during elongation until fiber fracture and display excellent long-term stability at ambient conditions. Cyclic stretching up to 50% strain for at least 400 strain cycles reveals that the doped fibers exhibit high cyclic stability and retain their electrical conductivity. Finally, a directional strain sensing device, which makes use of the linear increase in resistance of the fibers up to 120% strain is demonstrated.

electrical stretchability

conjugated polymers

polyurethane

electronic textiles

elastomer fibers

Author

Sepideh Zokaei

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Mariavittoria Craighero

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Claudia Cea

Columbia University

Lucas Maximilian Kneissl

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Renee Kroon

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Dion Khodagholy

Columbia University

Anja Lund

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Small

1613-6810 (ISSN) 1613-6829 (eISSN)

Vol. 18 5 2102813

Woven and 3D-Printed Thermoelectric Textiles (ThermoTex)

European Research Council (ERC) (637624), 2015-06-01 -- 2020-06-30.

Subject Categories

Polymer Chemistry

Polymer Technologies

Textile, Rubber and Polymeric Materials

DOI

10.1002/smll.202102813

More information

Latest update

4/5/2022 5