Effects of the crystallinity of orientation film and mesogenic core of liquid crystals for pretilt angle generation on rubbed polyimide surfaces

Dae Shik Seo, Shunsuke Kobayashi, Michinori Nishikawa, Yoshikazu Yabe

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The effect of the crystallinity of polyimide (PI) and of the birefringence of the liquid crystal on pretilt angle generation in nematics on rubbed PI surfaces containing thiophenylene moieties has been demonstrated. The induced optical retardation produced in rubbed PI surfaces decreases on increasing the imidization temperature. We suggest that the pretilt angle of 4-cyano-4'-n-pentylbiphenyl (5CB) depends on the crystallinity of the rubbed PI. The order of pretilt angle in NLCs is 5CB > PCH5 ≥ CCH5 at RS ≥ 150 mm (medium rubbing) on rubbed PI surfaces. We suggest that on rubbed PI surfaces the pretilt angle increases with increasing number of phenyl rings in the NLC core.

Original languageEnglish
Pages (from-to)289-292
Number of pages4
JournalLiquid Crystals
Volume19
Issue number2
DOIs
Publication statusPublished - 1995 Aug

Fingerprint

Liquid Crystals
polyimides
Polyimides
Crystal orientation
Liquid crystals
crystallinity
liquid crystals
Birefringence
birefringence
rings

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Effects of the crystallinity of orientation film and mesogenic core of liquid crystals for pretilt angle generation on rubbed polyimide surfaces",
abstract = "The effect of the crystallinity of polyimide (PI) and of the birefringence of the liquid crystal on pretilt angle generation in nematics on rubbed PI surfaces containing thiophenylene moieties has been demonstrated. The induced optical retardation produced in rubbed PI surfaces decreases on increasing the imidization temperature. We suggest that the pretilt angle of 4-cyano-4'-n-pentylbiphenyl (5CB) depends on the crystallinity of the rubbed PI. The order of pretilt angle in NLCs is 5CB > PCH5 ≥ CCH5 at RS ≥ 150 mm (medium rubbing) on rubbed PI surfaces. We suggest that on rubbed PI surfaces the pretilt angle increases with increasing number of phenyl rings in the NLC core.",
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Effects of the crystallinity of orientation film and mesogenic core of liquid crystals for pretilt angle generation on rubbed polyimide surfaces. / Seo, Dae Shik; Kobayashi, Shunsuke; Nishikawa, Michinori; Yabe, Yoshikazu.

In: Liquid Crystals, Vol. 19, No. 2, 08.1995, p. 289-292.

Research output: Contribution to journalArticle

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T1 - Effects of the crystallinity of orientation film and mesogenic core of liquid crystals for pretilt angle generation on rubbed polyimide surfaces

AU - Seo, Dae Shik

AU - Kobayashi, Shunsuke

AU - Nishikawa, Michinori

AU - Yabe, Yoshikazu

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AB - The effect of the crystallinity of polyimide (PI) and of the birefringence of the liquid crystal on pretilt angle generation in nematics on rubbed PI surfaces containing thiophenylene moieties has been demonstrated. The induced optical retardation produced in rubbed PI surfaces decreases on increasing the imidization temperature. We suggest that the pretilt angle of 4-cyano-4'-n-pentylbiphenyl (5CB) depends on the crystallinity of the rubbed PI. The order of pretilt angle in NLCs is 5CB > PCH5 ≥ CCH5 at RS ≥ 150 mm (medium rubbing) on rubbed PI surfaces. We suggest that on rubbed PI surfaces the pretilt angle increases with increasing number of phenyl rings in the NLC core.

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