Relationship between Pretilt Angles of Liquid Crystals and Surface Energies of Polyimides Containing Fluorine Atoms

M. Nishikawa, T. Miyamoto, S. Kawamura, Y. Tsuda, N. Bessho, Dae-Shik Seo, Y. Iimura, S. Kobayashi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We have synthesized the novel organic-solvent-soluble polyimides having helix backbone structure and containing four different types of diamine with trifluoromethyl groups as alignment films for liquid crystal displays. These alignment films show the pretilt angles of liquid crystal from 2° up to 40°. The surface energies of these polyimide films show a monotonic decrease with the increase of concentration of fluorine atoms in polyimide films. This tendency commonly occurs for four different fluorine containing diamines. A clear relationship between the surface energy of polyimide films and the pretilt angles ofliquid crystal on polyimide films was not obtained. The dependence of the obtained pretilt angles on the chemical structure of the polyimides is as follows: the polyimides with fluorine atoms in the lateral benzene rings, which are capable of generating a high pretilt angle of up to 40°, show the linear increasing of pretilt angles with the decreasing of the surface energies. On the other hand, the polyimides with fluorine atoms in polymer backbones show a maximum value of pretilt angles in the medium ranges. These results suggest that the microscopic surface structure of polyimides largely affect the generation of the pretilt angle at the boundary surface between liquid crystals and alignment films.

Original languageEnglish
Pages (from-to)285-290
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume258
Issue number1
DOIs
Publication statusPublished - 1995 Jan 1

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Liquid Crystals
Fluorine
polyimides
Interfacial energy
Polyimides
Liquid crystals
surface energy
fluorine
liquid crystals
Atoms
atoms
energy
Diamines
alignment
diamines
Benzene
Liquid crystal displays
Surface structure
helices
Organic solvents

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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title = "Relationship between Pretilt Angles of Liquid Crystals and Surface Energies of Polyimides Containing Fluorine Atoms",
abstract = "We have synthesized the novel organic-solvent-soluble polyimides having helix backbone structure and containing four different types of diamine with trifluoromethyl groups as alignment films for liquid crystal displays. These alignment films show the pretilt angles of liquid crystal from 2° up to 40°. The surface energies of these polyimide films show a monotonic decrease with the increase of concentration of fluorine atoms in polyimide films. This tendency commonly occurs for four different fluorine containing diamines. A clear relationship between the surface energy of polyimide films and the pretilt angles ofliquid crystal on polyimide films was not obtained. The dependence of the obtained pretilt angles on the chemical structure of the polyimides is as follows: the polyimides with fluorine atoms in the lateral benzene rings, which are capable of generating a high pretilt angle of up to 40°, show the linear increasing of pretilt angles with the decreasing of the surface energies. On the other hand, the polyimides with fluorine atoms in polymer backbones show a maximum value of pretilt angles in the medium ranges. These results suggest that the microscopic surface structure of polyimides largely affect the generation of the pretilt angle at the boundary surface between liquid crystals and alignment films.",
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Relationship between Pretilt Angles of Liquid Crystals and Surface Energies of Polyimides Containing Fluorine Atoms. / Nishikawa, M.; Miyamoto, T.; Kawamura, S.; Tsuda, Y.; Bessho, N.; Seo, Dae-Shik; Iimura, Y.; Kobayashi, S.

In: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol. 258, No. 1, 01.01.1995, p. 285-290.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Relationship between Pretilt Angles of Liquid Crystals and Surface Energies of Polyimides Containing Fluorine Atoms

AU - Nishikawa, M.

AU - Miyamoto, T.

AU - Kawamura, S.

AU - Tsuda, Y.

AU - Bessho, N.

AU - Seo, Dae-Shik

AU - Iimura, Y.

AU - Kobayashi, S.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - We have synthesized the novel organic-solvent-soluble polyimides having helix backbone structure and containing four different types of diamine with trifluoromethyl groups as alignment films for liquid crystal displays. These alignment films show the pretilt angles of liquid crystal from 2° up to 40°. The surface energies of these polyimide films show a monotonic decrease with the increase of concentration of fluorine atoms in polyimide films. This tendency commonly occurs for four different fluorine containing diamines. A clear relationship between the surface energy of polyimide films and the pretilt angles ofliquid crystal on polyimide films was not obtained. The dependence of the obtained pretilt angles on the chemical structure of the polyimides is as follows: the polyimides with fluorine atoms in the lateral benzene rings, which are capable of generating a high pretilt angle of up to 40°, show the linear increasing of pretilt angles with the decreasing of the surface energies. On the other hand, the polyimides with fluorine atoms in polymer backbones show a maximum value of pretilt angles in the medium ranges. These results suggest that the microscopic surface structure of polyimides largely affect the generation of the pretilt angle at the boundary surface between liquid crystals and alignment films.

AB - We have synthesized the novel organic-solvent-soluble polyimides having helix backbone structure and containing four different types of diamine with trifluoromethyl groups as alignment films for liquid crystal displays. These alignment films show the pretilt angles of liquid crystal from 2° up to 40°. The surface energies of these polyimide films show a monotonic decrease with the increase of concentration of fluorine atoms in polyimide films. This tendency commonly occurs for four different fluorine containing diamines. A clear relationship between the surface energy of polyimide films and the pretilt angles ofliquid crystal on polyimide films was not obtained. The dependence of the obtained pretilt angles on the chemical structure of the polyimides is as follows: the polyimides with fluorine atoms in the lateral benzene rings, which are capable of generating a high pretilt angle of up to 40°, show the linear increasing of pretilt angles with the decreasing of the surface energies. On the other hand, the polyimides with fluorine atoms in polymer backbones show a maximum value of pretilt angles in the medium ranges. These results suggest that the microscopic surface structure of polyimides largely affect the generation of the pretilt angle at the boundary surface between liquid crystals and alignment films.

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