Photo-alignment of low-molecular mass nematic liquid crystals on photochemically bifunctional chalcone-epoxy film by irradiation of a linearly polarized UV light

Dong Hoon Choi, Young Kwan Cha

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Photocrosslinkable chalcone-epoxy compound comprising 1,3-bis-(4-hydroxy-phenyl)-propenone was synthesized for fabricating the photo-alignment layer of liquid crystals. Chalcone group was introduced into the main chain unit of the epoxy oligomer. We observed a photodimerization behavior and an optical anisotropy of this material by irradiation of a linearly polarized UV(LP-UV) light. With a trace amount of cationic photoinitiator (TRS-HFA), polymerization of epoxy groups was also conducted at the similar wavelength range used for photodimerization. Linearly polarized UV irradiation on the chalcone-epoxy films with cationic photoinitiator induced optical anisotropy of the film and the resultant film can be used for alignment layers for low molecular weight nematic liquid crystals.

Original languageEnglish
Pages (from-to)587-592
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume23
Issue number4
Publication statusPublished - 2002 Apr 20
Externally publishedYes

Fingerprint

Chalcone
Nematic liquid crystals
Molecular mass
Ultraviolet radiation
Optical anisotropy
Irradiation
Liquid Crystals
Epoxy Compounds
Oligomers
Molecular weight
Polymerization
Wavelength

Keywords

  • Chalcone-epoxy
  • Liquid crystal alignment
  • Optical anisotropy
  • Photodimerization
  • Photopolymerization

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

@article{35fac2053e5648e2861f76131d48a24d,
title = "Photo-alignment of low-molecular mass nematic liquid crystals on photochemically bifunctional chalcone-epoxy film by irradiation of a linearly polarized UV light",
abstract = "Photocrosslinkable chalcone-epoxy compound comprising 1,3-bis-(4-hydroxy-phenyl)-propenone was synthesized for fabricating the photo-alignment layer of liquid crystals. Chalcone group was introduced into the main chain unit of the epoxy oligomer. We observed a photodimerization behavior and an optical anisotropy of this material by irradiation of a linearly polarized UV(LP-UV) light. With a trace amount of cationic photoinitiator (TRS-HFA), polymerization of epoxy groups was also conducted at the similar wavelength range used for photodimerization. Linearly polarized UV irradiation on the chalcone-epoxy films with cationic photoinitiator induced optical anisotropy of the film and the resultant film can be used for alignment layers for low molecular weight nematic liquid crystals.",
keywords = "Chalcone-epoxy, Liquid crystal alignment, Optical anisotropy, Photodimerization, Photopolymerization",
author = "Choi, {Dong Hoon} and Cha, {Young Kwan}",
year = "2002",
month = "4",
day = "20",
language = "English",
volume = "23",
pages = "587--592",
journal = "Bulletin of the Korean Chemical Society",
issn = "0253-2964",
publisher = "Wiley-Blackwell",
number = "4",

}

TY - JOUR

T1 - Photo-alignment of low-molecular mass nematic liquid crystals on photochemically bifunctional chalcone-epoxy film by irradiation of a linearly polarized UV light

AU - Choi, Dong Hoon

AU - Cha, Young Kwan

PY - 2002/4/20

Y1 - 2002/4/20

N2 - Photocrosslinkable chalcone-epoxy compound comprising 1,3-bis-(4-hydroxy-phenyl)-propenone was synthesized for fabricating the photo-alignment layer of liquid crystals. Chalcone group was introduced into the main chain unit of the epoxy oligomer. We observed a photodimerization behavior and an optical anisotropy of this material by irradiation of a linearly polarized UV(LP-UV) light. With a trace amount of cationic photoinitiator (TRS-HFA), polymerization of epoxy groups was also conducted at the similar wavelength range used for photodimerization. Linearly polarized UV irradiation on the chalcone-epoxy films with cationic photoinitiator induced optical anisotropy of the film and the resultant film can be used for alignment layers for low molecular weight nematic liquid crystals.

AB - Photocrosslinkable chalcone-epoxy compound comprising 1,3-bis-(4-hydroxy-phenyl)-propenone was synthesized for fabricating the photo-alignment layer of liquid crystals. Chalcone group was introduced into the main chain unit of the epoxy oligomer. We observed a photodimerization behavior and an optical anisotropy of this material by irradiation of a linearly polarized UV(LP-UV) light. With a trace amount of cationic photoinitiator (TRS-HFA), polymerization of epoxy groups was also conducted at the similar wavelength range used for photodimerization. Linearly polarized UV irradiation on the chalcone-epoxy films with cationic photoinitiator induced optical anisotropy of the film and the resultant film can be used for alignment layers for low molecular weight nematic liquid crystals.

KW - Chalcone-epoxy

KW - Liquid crystal alignment

KW - Optical anisotropy

KW - Photodimerization

KW - Photopolymerization

UR - http://www.scopus.com/inward/record.url?scp=0037140515&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037140515&partnerID=8YFLogxK

M3 - Article

VL - 23

SP - 587

EP - 592

JO - Bulletin of the Korean Chemical Society

JF - Bulletin of the Korean Chemical Society

SN - 0253-2964

IS - 4

ER -