UV-induced vertical alignment liquid crystal cell with two species of monomers having vertical-alignment-induced side-chain group and phenanthrene group

We propose the method for formation of the vertical alignment polymer film by polymerisation of the monomers being dissolved in the liquid crystal (LC) material. For obtaining the vertical alignment, combination of the two monomers, 4-(4'-octyloxy-biphenyl-4-yloxy)-butyl ester (AOBBE) and 2,7-d...

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Bibliographic Details
Published in:Liquid crystals 2018-04, Vol.45 (5), p.765-773
Main Authors: Mizusaki, Masanobu, Enomoto, Satoshi
Format: Article
Language:English
Subjects:
Alignment
Crystal defects
Cyclones
Direct current
Electric potential
Exposure
High voltage
Liquid crystals
Monomers
Phenanthrene
Polymer films
Polymerization
Ultraviolet radiation
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Summary:We propose the method for formation of the vertical alignment polymer film by polymerisation of the monomers being dissolved in the liquid crystal (LC) material. For obtaining the vertical alignment, combination of the two monomers, 4-(4'-octyloxy-biphenyl-4-yloxy)-butyl ester (AOBBE) and 2,7-dimethacryloyl-oxy-phenanthrene (DMAPhen), was found to be useful.The monomer DMAPhen initiates the polymerisation under UV light exposure, and the AOBBE unit induces the vertical alignment without generating any alignment defects. The monomer DMAPhen is useful for maintaining the high voltage holding ratio and low residual direct current voltage after UV light exposure because the molecules of DMAPhen do not remain in the LC layer.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2017.1382583