Detailed investigation on factors governing liquid crystal alignment on rubbed polystyrene films

Suk Gyu Hahm; Taek Joon Lee; Seung Woo Lee; Jinhwan Yoon; Moonhor Ree

doi:10.1016/j.mseb.2006.02.036

Detailed investigation on factors governing liquid crystal alignment on rubbed polystyrene films

Suk Gyu Hahm, Taek Joon Lee, Seung Woo Lee, Jinhwan Yoon, Moonhor Ree

Department of Chemical Engineering

Pohang University of Science and Technology

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

13 Scopus citations

Abstract

The molecular orientations and surface morphologies of rubbed films formed from atactic polystyrene (PS) samples with various molecular weights were investigated in detail. Previously unknown surface topography features were newly discovered in rubbed films, depending on molecular weights: submicroscale groove-like meandering structures composed of fine-grooves like pebbles in 10 nm are present, oriented perpendicular to the rubbing direction. The vinyl main chains, however, were preferentially oriented along the rubbing direction and the planes of the phenyl side groups were preferentially oriented perpendicular to the rubbing direction with para-directions that were positioned nearly normal to the film plane. Nematic liquid crystal (LC) molecules were found to always align on the rubbed PS surfaces along the orientation direction of the submicroscale grooves generated by rubbing.

Original language	English
Pages (from-to)	54-58
Number of pages	5
Journal	Materials Science and Engineering: B
Volume	132
Issue number	1-2
DOIs	https://doi.org/10.1016/j.mseb.2006.02.036
State	Published - 25 Jul 2006

Keywords

Alignment layer
Anisotropic interaction
Orientation
Rubbing

Access to Document

10.1016/j.mseb.2006.02.036

Cite this

@article{031cfd8593a84f5b946ff2adca4f9ba6,

title = "Detailed investigation on factors governing liquid crystal alignment on rubbed polystyrene films",

abstract = "The molecular orientations and surface morphologies of rubbed films formed from atactic polystyrene (PS) samples with various molecular weights were investigated in detail. Previously unknown surface topography features were newly discovered in rubbed films, depending on molecular weights: submicroscale groove-like meandering structures composed of fine-grooves like pebbles in 10 nm are present, oriented perpendicular to the rubbing direction. The vinyl main chains, however, were preferentially oriented along the rubbing direction and the planes of the phenyl side groups were preferentially oriented perpendicular to the rubbing direction with para-directions that were positioned nearly normal to the film plane. Nematic liquid crystal (LC) molecules were found to always align on the rubbed PS surfaces along the orientation direction of the submicroscale grooves generated by rubbing.",

keywords = "Alignment layer, Anisotropic interaction, Orientation, Rubbing",

author = "Hahm, {Suk Gyu} and Lee, {Taek Joon} and Lee, {Seung Woo} and Jinhwan Yoon and Moonhor Ree",

year = "2006",

month = jul,

day = "25",

doi = "10.1016/j.mseb.2006.02.036",

language = "English",

volume = "132",

pages = "54--58",

journal = "Materials Science and Engineering: B",

issn = "0921-5107",

publisher = "Elsevier Ltd.",

number = "1-2",

}

TY - JOUR

T1 - Detailed investigation on factors governing liquid crystal alignment on rubbed polystyrene films

AU - Hahm, Suk Gyu

AU - Lee, Taek Joon

AU - Lee, Seung Woo

AU - Yoon, Jinhwan

AU - Ree, Moonhor

PY - 2006/7/25

Y1 - 2006/7/25

N2 - The molecular orientations and surface morphologies of rubbed films formed from atactic polystyrene (PS) samples with various molecular weights were investigated in detail. Previously unknown surface topography features were newly discovered in rubbed films, depending on molecular weights: submicroscale groove-like meandering structures composed of fine-grooves like pebbles in 10 nm are present, oriented perpendicular to the rubbing direction. The vinyl main chains, however, were preferentially oriented along the rubbing direction and the planes of the phenyl side groups were preferentially oriented perpendicular to the rubbing direction with para-directions that were positioned nearly normal to the film plane. Nematic liquid crystal (LC) molecules were found to always align on the rubbed PS surfaces along the orientation direction of the submicroscale grooves generated by rubbing.

AB - The molecular orientations and surface morphologies of rubbed films formed from atactic polystyrene (PS) samples with various molecular weights were investigated in detail. Previously unknown surface topography features were newly discovered in rubbed films, depending on molecular weights: submicroscale groove-like meandering structures composed of fine-grooves like pebbles in 10 nm are present, oriented perpendicular to the rubbing direction. The vinyl main chains, however, were preferentially oriented along the rubbing direction and the planes of the phenyl side groups were preferentially oriented perpendicular to the rubbing direction with para-directions that were positioned nearly normal to the film plane. Nematic liquid crystal (LC) molecules were found to always align on the rubbed PS surfaces along the orientation direction of the submicroscale grooves generated by rubbing.

KW - Alignment layer

KW - Anisotropic interaction

KW - Orientation

KW - Rubbing

UR - http://www.scopus.com/inward/record.url?scp=33746593316&partnerID=8YFLogxK

U2 - 10.1016/j.mseb.2006.02.036

DO - 10.1016/j.mseb.2006.02.036

M3 - Article

AN - SCOPUS:33746593316

SN - 0921-5107

VL - 132

SP - 54

EP - 58

JO - Materials Science and Engineering: B

JF - Materials Science and Engineering: B

IS - 1-2

ER -

Detailed investigation on factors governing liquid crystal alignment on rubbed polystyrene films

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this