Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups

Hyo Kang; Hyunkee Hong; Dong Gyun Kim; Eun Ho Sohn; Jimin Shim; Daeseung Kang; Jong Chan Lee

doi:10.1080/02678292.2014.960487

Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups

Hyo Kang, Hyunkee Hong, Dong Gyun Kim, Eun Ho Sohn, Jimin Shim, Daeseung Kang, Jong Chan Lee

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

A series of poly(methyl methacrylate) derivatives containing polyhedral oligomeric silsesquioxane (POSS) groups (MCP#) were synthesised via free radical polymerisation (FRP) using methacryl isobutyl POSS (MA-POSS) and methyl methacrylate as monomers to investigate liquid crystal (LC) alignment property of these polymer films. The LC cells made from the films of the polymers having 100 mol% of MA-POSS units (MCP100) showed vertical LC alignment having a pretilt angle of about 90°. The vertical LC alignment behaviour on the MCP100 film was ascribed to the very hydrophobic MCP100 surface having the surface energy value smaller than about 23 mJ/m² generated by the nonpolar bulky POSS group. Good electro-optical characteristics, such as voltage holding ratio (VHR) and residual DC voltage (R-DC), were observed for the LC cells fabricated using MCP100 as a LC alignment layer.

Original language	English (US)
Pages (from-to)	32-40
Number of pages	9
Journal	Liquid Crystals
Volume	42
Issue number	1
DOIs	https://doi.org/10.1080/02678292.2014.960487
State	Published - Jan 2 2015

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Publisher Copyright:
© 2014 Taylor & Francis.

Keywords

alignment
liquid crystal
polyhedral oligomeric silsesquioxane
vertical

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10.1080/02678292.2014.960487

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title = "Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups",

abstract = "A series of poly(methyl methacrylate) derivatives containing polyhedral oligomeric silsesquioxane (POSS) groups (MCP#) were synthesised via free radical polymerisation (FRP) using methacryl isobutyl POSS (MA-POSS) and methyl methacrylate as monomers to investigate liquid crystal (LC) alignment property of these polymer films. The LC cells made from the films of the polymers having 100 mol% of MA-POSS units (MCP100) showed vertical LC alignment having a pretilt angle of about 90°. The vertical LC alignment behaviour on the MCP100 film was ascribed to the very hydrophobic MCP100 surface having the surface energy value smaller than about 23 mJ/m2 generated by the nonpolar bulky POSS group. Good electro-optical characteristics, such as voltage holding ratio (VHR) and residual DC voltage (R-DC), were observed for the LC cells fabricated using MCP100 as a LC alignment layer.",

keywords = "alignment, liquid crystal, polyhedral oligomeric silsesquioxane, vertical",

author = "Hyo Kang and Hyunkee Hong and Kim, {Dong Gyun} and Sohn, {Eun Ho} and Jimin Shim and Daeseung Kang and Lee, {Jong Chan}",

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year = "2015",

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doi = "10.1080/02678292.2014.960487",

language = "English (US)",

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T1 - Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups

AU - Kang, Hyo

AU - Hong, Hyunkee

AU - Kim, Dong Gyun

AU - Sohn, Eun Ho

AU - Shim, Jimin

AU - Kang, Daeseung

AU - Lee, Jong Chan

PY - 2015/1/2

Y1 - 2015/1/2

N2 - A series of poly(methyl methacrylate) derivatives containing polyhedral oligomeric silsesquioxane (POSS) groups (MCP#) were synthesised via free radical polymerisation (FRP) using methacryl isobutyl POSS (MA-POSS) and methyl methacrylate as monomers to investigate liquid crystal (LC) alignment property of these polymer films. The LC cells made from the films of the polymers having 100 mol% of MA-POSS units (MCP100) showed vertical LC alignment having a pretilt angle of about 90°. The vertical LC alignment behaviour on the MCP100 film was ascribed to the very hydrophobic MCP100 surface having the surface energy value smaller than about 23 mJ/m2 generated by the nonpolar bulky POSS group. Good electro-optical characteristics, such as voltage holding ratio (VHR) and residual DC voltage (R-DC), were observed for the LC cells fabricated using MCP100 as a LC alignment layer.

AB - A series of poly(methyl methacrylate) derivatives containing polyhedral oligomeric silsesquioxane (POSS) groups (MCP#) were synthesised via free radical polymerisation (FRP) using methacryl isobutyl POSS (MA-POSS) and methyl methacrylate as monomers to investigate liquid crystal (LC) alignment property of these polymer films. The LC cells made from the films of the polymers having 100 mol% of MA-POSS units (MCP100) showed vertical LC alignment having a pretilt angle of about 90°. The vertical LC alignment behaviour on the MCP100 film was ascribed to the very hydrophobic MCP100 surface having the surface energy value smaller than about 23 mJ/m2 generated by the nonpolar bulky POSS group. Good electro-optical characteristics, such as voltage holding ratio (VHR) and residual DC voltage (R-DC), were observed for the LC cells fabricated using MCP100 as a LC alignment layer.

KW - alignment

KW - liquid crystal

KW - polyhedral oligomeric silsesquioxane

KW - vertical

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DO - 10.1080/02678292.2014.960487

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JF - Liquid Crystals

IS - 1

ER -

Liquid crystal alignment behaviours on poly(methyl methacrylate) having polyhedral oligomeric silsesquioxane groups

Abstract

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