New approach toward reflective films and fibers using cholesteric liquid-crystal coatings

Olivier T. Picot (Corresponding author), Mian Dai, Dirk J. Broer, Ton Peijs, Cees W.M. Bastiaansen

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
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Abstract

A new approach for the production of oriented films and fibers with angular-dependent reflective colors is presented. The process consists of spray coating a solution of cholesteric liquid-crystalline monomers onto a melt-processed and oriented polyamide-6 substrate followed by UV curing. Reflectivity measurements and optical microscopy show that a well-defined liquid-crystalline and planar alignment is obtained. It is further demonstrated that a reflection up to 80% is obtained by coating oriented films on both sides of the oriented substrate with a single-handedness cholesteric liquid-crystal coating. The high reflectivity is attributed to the close to half-wave retardation induced by the anisotropic polymer substrate. Also, polyamide-6 filaments are successfully coated and fibers are obtained with an angular-dependent color in a single dimension along the fiber direction, which originates from the planar cholesteric alignment on a curved surface.

Original languageEnglish
Pages (from-to)7117-7121
Number of pages5
JournalACS Applied Materials & Interfaces
Volume5
Issue number15
DOIs
Publication statusPublished - 14 Aug 2013

Keywords

  • cholesteric liquid crystal
  • coloration
  • cross-linked network
  • fibers
  • functional coating
  • self-organizing

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