Toughening of a Soft Polar Polythiophene through Copolymerization with Hard Urethane Segments

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, Christian Müller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Polar polythiophenes with oligoethylene glycol side chains are exceedingly soft materials. A low glass transition temperature and low degree of crystallinity prevents their use as a bulk material. The synthesis of a copolymer comprising 1) soft polythiophene blocks with tetraethylene glycol side chains, and 2) hard urethane segments is reported. The molecular design is contrary to that of other semiconductor-insulator copolymers, which typically combine a soft nonconjugated spacer with hard conjugated segments. Copolymerization of polar polythiophenes and urethane segments results in a ductile material that can be used as a free-standing solid. The copolymer displays a storage modulus of 25 MPa at room temperature, elongation at break of 95%, and a reduced degree of swelling due to hydrogen bonding. Both chemical doping and electrochemical oxidation reveal that the introduction of urethane segments does not unduly reduce the hole charge-carrier mobility and ability to take up charge. Further, stable operation is observed when the copolymer is used as the active layer of organic electrochemical transistors.

Original languageEnglish (US)
Article number2002778
JournalAdvanced Science
Volume8
Issue number2
DOIs
StatePublished - Jan 20 2021

Keywords

  • chemical and electrochemical doping
  • organic electrochemical transistors (OECT)
  • polar conjugated polymers
  • swelling
  • urethane

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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