Engineering the chemical structure of H-shaped reactive molecules for negative dispersion of retardation

Jaeheung Im, Ja Won Kim, Yi Young Kang, Yunsu Nam, Won Gun Koh, Jae Won Ka, Ji Hoon Lee

Research output: Contribution to journalArticlepeer-review


Five kinds of H-shaped reactive monomers with different central core groups were newly designed and synthesized for obtaining a negative dispersion of retardation. The H-shaped molecules were mixed with cylindrical reactive mesogen molecules and the mixtures with the H-shaped molecules wherein a benzene or a naphthalene ring is in the core presented a wide liquid crystalline phase and a uniform orientation. The retarder film made by UV-polymerization of the mixtures showed a positive or a negative dispersion of retardation depending on the chemical structure of the H-shaped molecules. To understand the different dispersion properties, the molecular orientation of the H-shaped molecules was investigated by measuring the UV-vis absorption anisotropy and out-of-plane retardation of the samples. The retarder sample showed a negative dispersion of retardation when the imine groups of the H-shaped molecules were aligned orthogonal to the slow axis of the sample.

Original languageEnglish
Pages (from-to)1467-1476
Number of pages10
JournalMolecular Systems Design and Engineering
Issue number11
Publication statusPublished - 2022 Jul 23

Bibliographical note

Funding Information:
This study was supported by a grant from the National Research Foundation (NRF, 2019R1A2B5B01069580, 2019R1A6A1A09031717), and the Ministry of Trade, Industry, and Energy (20011031).

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Chemical Engineering (miscellaneous)
  • Biomedical Engineering
  • Energy Engineering and Power Technology
  • Process Chemistry and Technology
  • Industrial and Manufacturing Engineering
  • Materials Chemistry


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