Improved mechanical properties of a polar polythiophene through copolymerization or blending with urethanes
Licentiatavhandling, 2020

Polar polythiophenes with oligoethylene glycol side chains are a developing class of materials that are great candidates for energy harvesting and storage as well as bioelectronics. The polar side chains enhance the compatibility with molecular dopants and improve the electrical conductivity and thermal stability of the doped material. However, polar polythiophenes are extremely soft at room temperature due to a sub-zero glass transition temperature. To enhance the usefulness of these polymers in electronic devices, strategies are needed for tuning their mechanical properties, particularly increasing their robustness. In this thesis we report our efforts to copolymerize a polar polythiophene with urethane blocks to increase the toughness of the material without unduly reducing its electrical and electrochemical properties. Further, we describe wet spinning blend of a polar polythiophene with polyurethane into fibers. The resulting fibers with low hysteresis exhibit elasticity and stretchability, yet higher stiffness.

conductive fibers

polar conjugated polymers

mechanical properties


Sepideh Zokaei

Chalmers, Kemi och kemiteknik, Tillämpad kemi

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Advanced Electronic Materials,; Vol. 6(2020)

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Robust PEDOT:PSS Wet‐Spun Fibers for Thermoelectric Textiles

Macromolecular Materials and Engineering,; Vol. 305(2020)p. 1900749-

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Sepideh Zokaei, Mariavittoria Craighero, Claudia Cea, Lucas M. Kneissl, Renee Kroon, Dion Khodagholy, Anja Lund and Christian Müller. Highly stretchable electrically conducting polymer fibers with low hysteresis

Sepideh Zokaei, Renee Kroon, Johannes Gladisch, Bryan D. Paulsen, Wonil Sohn, Anna I. Hofmann, Gustav Persson, Arne Stamm, Per-Olof Syrén, Eva Olsson, Jonathan Rivnay, Eleni Stavrinidou, Anja Lund and Christian Müller. Toughening of a Soft Polar Polythiophene through Copolymerization with Hard Urethane Segments







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