Thermally stable poly(styrene-maleic anhydride) layer modified by ion-beam for liquid crystal orientation

Hyo Young Mun, Hae Chang Jeong, Ju Hwan Lee, Jong Hoon Won, Byeong Yun Oh, Jeong Min Han, Dae Shik Seo

Research output: Contribution to journalArticle

Abstract

We report uniform and homogeneous liquid crystal (LC) alignment using ion beam (IB)-irradiated poly(styrene-maleic anhydride) (SMA) films as an alignment layer when the IB incidence angle is controlled. The molecular polarity on the SMA surface increased with IB irradiation, especially at an incidence angle of 30°, resulting in strong van der Waals forces between the LC molecules and the surface. Atomic force microscopy and X-ray photoelectron spectroscopy were used to determine the LC alignment mechanism. Chemical structure analysis indicated that the orientation of LC molecules was due to van der Waals forces and selective breaking of C–C bonds by IB irradiation. The potential application of SMA substrates as alignment layers for display devices was further supported by their higher thermal stability (220 °C) compared with that of conventional rubbed SMA (160 °C) and rubbed polyimide (160 °C). Therefore, LC cells with IB-irradiated SMA are potential candidates for alternative alignment layers in LC applications.

Original languageEnglish
Pages (from-to)58-64
Number of pages7
JournalMaterials Chemistry and Physics
Volume203
DOIs
Publication statusPublished - 2018 Jan 1

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Maleic Anhydrides
Liquid Crystals
Styrene
Maleic anhydride
anhydrides
Crystal orientation
Liquid crystals
Ion beams
polystyrene
ion beams
liquid crystals
styrenes
alignment
Van der Waals forces
Molecular polarity
incidence
Irradiation
Molecules
irradiation
display devices

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Mun, Hyo Young ; Jeong, Hae Chang ; Lee, Ju Hwan ; Won, Jong Hoon ; Oh, Byeong Yun ; Han, Jeong Min ; Seo, Dae Shik. / Thermally stable poly(styrene-maleic anhydride) layer modified by ion-beam for liquid crystal orientation. In: Materials Chemistry and Physics. 2018 ; Vol. 203. pp. 58-64.
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Thermally stable poly(styrene-maleic anhydride) layer modified by ion-beam for liquid crystal orientation. / Mun, Hyo Young; Jeong, Hae Chang; Lee, Ju Hwan; Won, Jong Hoon; Oh, Byeong Yun; Han, Jeong Min; Seo, Dae Shik.

In: Materials Chemistry and Physics, Vol. 203, 01.01.2018, p. 58-64.

Research output: Contribution to journalArticle

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AU - Mun, Hyo Young

AU - Jeong, Hae Chang

AU - Lee, Ju Hwan

AU - Won, Jong Hoon

AU - Oh, Byeong Yun

AU - Han, Jeong Min

AU - Seo, Dae Shik

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