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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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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