Washing effects on the anchoring energy and surface order parameter on rubbed polymer surfaces containing the trifluoromethyl moiety

Jeong Mim Han, Jeoung Yeon Hwang, Dae Shik Seo, Sang Keuk Lee, Joon Ung Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The washing effects on liquid crystal (LC) alignment capability in a NLC, 4-n-pentyl-4′-cyanobiphenyl (5CB), on a rubbed polyimide (PI) surface containing the trifluoromethyl moiety were studied. The extrapolation length de of 5CB on the rubbed PI surface decreases with the rubbing strength RS. Also, the large extrapolation length de of 5CB for washing with IPA was measured at RS = 114 mm. The polar anchoring energy of 5CB on the rubbed PI surface was decreased by the washing process; it increased with the rubbing strength RS on the PI surface. The surface order parameter S S of 5CB for all the washing processes is smaller than for the non-washing process. Consequently, the polar anchoring energy and surface order parameter SS in 5CB are largely attributed to washing effects.

Original languageEnglish
Pages (from-to)1259-1264
Number of pages6
JournalLiquid Crystals
Volume31
Issue number9
DOIs
Publication statusPublished - 2004 Sep 1

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washing
Washing
Polymers
polyimides
Polyimides
polymers
Extrapolation
energy
extrapolation
Liquid Crystals
Liquid crystals
liquid crystals
alignment

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Han, Jeong Mim ; Hwang, Jeoung Yeon ; Seo, Dae Shik ; Lee, Sang Keuk ; Lee, Joon Ung. / Washing effects on the anchoring energy and surface order parameter on rubbed polymer surfaces containing the trifluoromethyl moiety. In: Liquid Crystals. 2004 ; Vol. 31, No. 9. pp. 1259-1264.
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Washing effects on the anchoring energy and surface order parameter on rubbed polymer surfaces containing the trifluoromethyl moiety. / Han, Jeong Mim; Hwang, Jeoung Yeon; Seo, Dae Shik; Lee, Sang Keuk; Lee, Joon Ung.

In: Liquid Crystals, Vol. 31, No. 9, 01.09.2004, p. 1259-1264.

Research output: Contribution to journalArticle

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T1 - Washing effects on the anchoring energy and surface order parameter on rubbed polymer surfaces containing the trifluoromethyl moiety

AU - Han, Jeong Mim

AU - Hwang, Jeoung Yeon

AU - Seo, Dae Shik

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AU - Lee, Joon Ung

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AB - The washing effects on liquid crystal (LC) alignment capability in a NLC, 4-n-pentyl-4′-cyanobiphenyl (5CB), on a rubbed polyimide (PI) surface containing the trifluoromethyl moiety were studied. The extrapolation length de of 5CB on the rubbed PI surface decreases with the rubbing strength RS. Also, the large extrapolation length de of 5CB for washing with IPA was measured at RS = 114 mm. The polar anchoring energy of 5CB on the rubbed PI surface was decreased by the washing process; it increased with the rubbing strength RS on the PI surface. The surface order parameter S S of 5CB for all the washing processes is smaller than for the non-washing process. Consequently, the polar anchoring energy and surface order parameter SS in 5CB are largely attributed to washing effects.

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