Alignment of Lyotropic Liquid Crystalline Conjugated Polymers in Floating Films

Da Seul Yang, Maciej Barlóg, Jongsik Park, Kyeongwoon Chung, Apoorv Shanker, Jonathan Sun, Joonkoo Kang, Kwangyeol Lee, Mohammed Al-Hashimi, Jinsang Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Directed alignment of polymer chains plays an indispensable role in charge transport properties. We focus not only on a specific method to induce the alignment but also on the design of a liquid crystalline (LC) conjugated polymer to take advantage of an intrinsic self-assembly characteristic. We synthesized a lyotropic LC conjugated polymer, CP1-P, having o-nitrobenzyl (ONB) esters as photocleavable side chains and adopted a floating film transfer method to induce the polymer chain alignment through a lyotropic LC phase transition. An optimum amount of a high boiling point solvent (1,2-dichlorobenzene) in chloroform turned out to be an important factor to maximize the polymer chain alignment. The hole transport mobility along the polymer chain alignment direction was 13-14 times higher than that in the direction perpendicular to the alignment. In addition, the removal of side chains resulted in the solvent resistivity while maintaining the alignment feature in organic thin-film transistors.

Original languageEnglish
Pages (from-to)14807-14813
Number of pages7
JournalACS Omega
Volume3
Issue number11
DOIs
Publication statusPublished - 2018 Nov 5

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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    Yang, D. S., Barlóg, M., Park, J., Chung, K., Shanker, A., Sun, J., Kang, J., Lee, K., Al-Hashimi, M., & Kim, J. (2018). Alignment of Lyotropic Liquid Crystalline Conjugated Polymers in Floating Films. ACS Omega, 3(11), 14807-14813. https://doi.org/10.1021/acsomega.8b02205