Nonlinear optical spectroscopic studies of polymer surfaces for liquid crystal alignment: Photo-irradiated polyimide and rubbed polystyrene surfaces

Masahito Oh-e; Seok Cheol Hong; Y. R. Shen

doi:10.1080/15421400490440075

Nonlinear optical spectroscopic studies of polymer surfaces for liquid crystal alignment: Photo-irradiated polyimide and rubbed polystyrene surfaces

Masahito Oh-e, Seok Cheol Hong, Y. R. Shen

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

Surface specific sum-frequency vibrational spectroscopy (SFVS) and second-harmonic generation (SHG) were used to study the structures of polymer surfaces modified by linearly polarized UV irradiation or mechanical rubbing. The spectroscopic results show that the surface anisotropy of a polyimide surface resulting from bond breaking by linearly polarized UV irradiation is extremely small compared to a rubbed surface. On a rubbed polystyrene surface, the phenyl sidegroups are well aligned by rubbing in the direction perpendicular to rubbing but tilt from the surface normal with a broad distribution.

Original language	English
Pages (from-to)	339/[1949]-349/[1959]
Journal	Molecular Crystals and Liquid Crystals
Volume	412
DOIs	https://doi.org/10.1080/15421400490440075
Publication status	Published - 2004
Externally published	Yes
Event	Proceedings of the 19th International Liquid Crystal Conference, ILCC2002 - Edinburgh, United Kingdom Duration: 2002 Jun 30 → 2002 Jul 5

Keywords

Interface
Liquid crystal
Nonlinear optics
Polyimide
Sum-frequency generation
Surface
Vibrational spectroscopy

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1080/15421400490440075

Cite this

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title = "Nonlinear optical spectroscopic studies of polymer surfaces for liquid crystal alignment: Photo-irradiated polyimide and rubbed polystyrene surfaces",

abstract = "Surface specific sum-frequency vibrational spectroscopy (SFVS) and second-harmonic generation (SHG) were used to study the structures of polymer surfaces modified by linearly polarized UV irradiation or mechanical rubbing. The spectroscopic results show that the surface anisotropy of a polyimide surface resulting from bond breaking by linearly polarized UV irradiation is extremely small compared to a rubbed surface. On a rubbed polystyrene surface, the phenyl sidegroups are well aligned by rubbing in the direction perpendicular to rubbing but tilt from the surface normal with a broad distribution.",

keywords = "Interface, Liquid crystal, Nonlinear optics, Polyimide, Sum-frequency generation, Surface, Vibrational spectroscopy",

author = "Masahito Oh-e and Hong, {Seok Cheol} and Shen, {Y. R.}",

note = "Funding Information: This work was supported by U.S. National Science Foundation Grant DMR-0075402 and partially by Hitachi, Ltd. in Japan. M. O. acknowledges the financial support by Hitachi, Ltd. Address correspondence to Masahito Oh-e, Yokoyama Nano-Structured LC Project ERATO, Japan Science & Technology Agency, 5-9-9 Tokodai, Tsukuba, Ibaraki-ken, 300-2635 Japan.; Proceedings of the 19th International Liquid Crystal Conference, ILCC2002 ; Conference date: 30-06-2002 Through 05-07-2002",

year = "2004",

doi = "10.1080/15421400490440075",

language = "English",

volume = "412",

pages = "339/[1949]--349/[1959]",

journal = "Molecular Crystals and Liquid Crystals",

issn = "1542-1406",

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T1 - Nonlinear optical spectroscopic studies of polymer surfaces for liquid crystal alignment

T2 - Proceedings of the 19th International Liquid Crystal Conference, ILCC2002

AU - Oh-e, Masahito

AU - Hong, Seok Cheol

AU - Shen, Y. R.

N1 - Funding Information: This work was supported by U.S. National Science Foundation Grant DMR-0075402 and partially by Hitachi, Ltd. in Japan. M. O. acknowledges the financial support by Hitachi, Ltd. Address correspondence to Masahito Oh-e, Yokoyama Nano-Structured LC Project ERATO, Japan Science & Technology Agency, 5-9-9 Tokodai, Tsukuba, Ibaraki-ken, 300-2635 Japan.

PY - 2004

Y1 - 2004

N2 - Surface specific sum-frequency vibrational spectroscopy (SFVS) and second-harmonic generation (SHG) were used to study the structures of polymer surfaces modified by linearly polarized UV irradiation or mechanical rubbing. The spectroscopic results show that the surface anisotropy of a polyimide surface resulting from bond breaking by linearly polarized UV irradiation is extremely small compared to a rubbed surface. On a rubbed polystyrene surface, the phenyl sidegroups are well aligned by rubbing in the direction perpendicular to rubbing but tilt from the surface normal with a broad distribution.

AB - Surface specific sum-frequency vibrational spectroscopy (SFVS) and second-harmonic generation (SHG) were used to study the structures of polymer surfaces modified by linearly polarized UV irradiation or mechanical rubbing. The spectroscopic results show that the surface anisotropy of a polyimide surface resulting from bond breaking by linearly polarized UV irradiation is extremely small compared to a rubbed surface. On a rubbed polystyrene surface, the phenyl sidegroups are well aligned by rubbing in the direction perpendicular to rubbing but tilt from the surface normal with a broad distribution.

KW - Interface

KW - Liquid crystal

KW - Nonlinear optics

KW - Polyimide

KW - Sum-frequency generation

KW - Surface

KW - Vibrational spectroscopy

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U2 - 10.1080/15421400490440075

DO - 10.1080/15421400490440075

M3 - Conference article

AN - SCOPUS:12844264165

SN - 1542-1406

VL - 412

SP - 339/[1949]-349/[1959]

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

Y2 - 30 June 2002 through 5 July 2002

ER -

Nonlinear optical spectroscopic studies of polymer surfaces for liquid crystal alignment: Photo-irradiated polyimide and rubbed polystyrene surfaces

Abstract

Keywords

ASJC Scopus subject areas

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