Influence of the washing process on the aligning capability of a nematic liquid crystal on polymer surfaces

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The influence of washing processes on the liquid crystal (LC) aligning capability on rubbed polyimide (PI) surfaces containing the CONH moiety were investigated. The induced optical retardation from a non-washing process on a rubbed PI surface is larger than when the washing processes are included. The pretilt angles in 4-n-pentyl-4'-cyanobiphenyl (5CB) were decreased by the washing process. The polar anchoring energy of 5CB was decreased by the washing processes on a weakly rubbed PI surface. The surface order parameter SS of 5CB strongly depends on the rubbing strength and washing materials. Consequently, the LC aligning capability may be strongly attributed to the polymer characteristics and the washing processes.

Original languageEnglish
Pages (from-to)789-793
Number of pages5
JournalLiquid Crystals
Issue number6
Publication statusPublished - 2000 Jan 1


All Science Journal Classification (ASJC) codes

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

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