Inclined alignment of polyimide backbone structures induced by single exposure of un-polarized light

Kenji Sakamoto; Kiyoaki Usami; Toru Sasaki; Yoichi Uehara; Sukekatsu Ushioda

doi:10.1080/15421400590954632

Inclined alignment of polyimide backbone structures induced by single exposure of un-polarized light

Kenji Sakamoto, Kiyoaki Usami, Toru Sasaki, Yoichi Uehara, Sukekatsu Ushioda

Information Devices Division

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1 Citation (Scopus)

Abstract

We have investigated the alignment of polyimide backbone structures induced by single oblique angle irradiation with un-polarized light (UP-light) of wavelength 340 ∼ 500 nm. The polyimide (Azo-PI) used in this study contains azobenzene in the backbone structure. The alignment of the backbone structure occurs through random angular rotation of the azobenzene molecule accompanied by its photoinduced trans-cis-trans isomerization. The photo-alignment treatment was performed on 16 nm thick films of polyamic acid (Azo-PAA) that is the precursor of Azo-PI. Subsequently, the Azo-PAA film was thermally imidized. The UP-light exposure was varied up to 882 J/cm². The orientational distribution of the Azo-PI backbone structure was determined, using polarized infrared absorption spectroscopy. We found that the average inclination angle and the in-plane order parameter of the backbone structure increased with UP-light exposure, reaching 51° from the surface plane and 0.1, respectively, at 882 J/cm².

Original language	English
Pages (from-to)	215/[1779]-226/[1790]
Journal	Molecular crystals and liquid crystals
Volume	438
DOIs	https://doi.org/10.1080/15421400590954632
Publication status	Published - 2005

Keywords

Azobenzene
Liquid crystal
Photo-induced alignment
Photo-isomerization
Polarized IR absorption
Polyimide

ASJC Scopus subject areas

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

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@article{355f09ffe3d34a2c80c02d3fd48849c0,

title = "Inclined alignment of polyimide backbone structures induced by single exposure of un-polarized light",

abstract = "We have investigated the alignment of polyimide backbone structures induced by single oblique angle irradiation with un-polarized light (UP-light) of wavelength 340 ∼ 500 nm. The polyimide (Azo-PI) used in this study contains azobenzene in the backbone structure. The alignment of the backbone structure occurs through random angular rotation of the azobenzene molecule accompanied by its photoinduced trans-cis-trans isomerization. The photo-alignment treatment was performed on 16 nm thick films of polyamic acid (Azo-PAA) that is the precursor of Azo-PI. Subsequently, the Azo-PAA film was thermally imidized. The UP-light exposure was varied up to 882 J/cm2. The orientational distribution of the Azo-PI backbone structure was determined, using polarized infrared absorption spectroscopy. We found that the average inclination angle and the in-plane order parameter of the backbone structure increased with UP-light exposure, reaching 51° from the surface plane and 0.1, respectively, at 882 J/cm2.",

keywords = "Azobenzene, Liquid crystal, Photo-induced alignment, Photo-isomerization, Polarized IR absorption, Polyimide",

author = "Kenji Sakamoto and Kiyoaki Usami and Toru Sasaki and Yoichi Uehara and Sukekatsu Ushioda",

note = "Funding Information: The authors are grateful to Professor J. Nishizawa for his valuable advice. We would like to thank S. Murata, N. Narita, and H. Ono of Chisso Co. Ltd. for supplying the Azo-PAA solution used in this work. We also thank T. Tadokoro of J. A. Woollam Japan Corp. for performing spectroscopic ellipsometry measurements to determine the refractive indices of Azo-PAA and Azo-PI films in the UV-visible region. This work was supported in part by a Grant-in-Aid for Scientific Research (B) from Japan Society for the Promotion of Science (No. 13450003).",

year = "2005",

doi = "10.1080/15421400590954632",

language = "English",

volume = "438",

pages = "215/[1779]--226/[1790]",

journal = "Molecular Crystals and Liquid Crystals",

issn = "1542-1406",

publisher = "Taylor and Francis Ltd.",

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T1 - Inclined alignment of polyimide backbone structures induced by single exposure of un-polarized light

AU - Sakamoto, Kenji

AU - Usami, Kiyoaki

AU - Sasaki, Toru

AU - Uehara, Yoichi

AU - Ushioda, Sukekatsu

N1 - Funding Information: The authors are grateful to Professor J. Nishizawa for his valuable advice. We would like to thank S. Murata, N. Narita, and H. Ono of Chisso Co. Ltd. for supplying the Azo-PAA solution used in this work. We also thank T. Tadokoro of J. A. Woollam Japan Corp. for performing spectroscopic ellipsometry measurements to determine the refractive indices of Azo-PAA and Azo-PI films in the UV-visible region. This work was supported in part by a Grant-in-Aid for Scientific Research (B) from Japan Society for the Promotion of Science (No. 13450003).

PY - 2005

Y1 - 2005

N2 - We have investigated the alignment of polyimide backbone structures induced by single oblique angle irradiation with un-polarized light (UP-light) of wavelength 340 ∼ 500 nm. The polyimide (Azo-PI) used in this study contains azobenzene in the backbone structure. The alignment of the backbone structure occurs through random angular rotation of the azobenzene molecule accompanied by its photoinduced trans-cis-trans isomerization. The photo-alignment treatment was performed on 16 nm thick films of polyamic acid (Azo-PAA) that is the precursor of Azo-PI. Subsequently, the Azo-PAA film was thermally imidized. The UP-light exposure was varied up to 882 J/cm2. The orientational distribution of the Azo-PI backbone structure was determined, using polarized infrared absorption spectroscopy. We found that the average inclination angle and the in-plane order parameter of the backbone structure increased with UP-light exposure, reaching 51° from the surface plane and 0.1, respectively, at 882 J/cm2.

AB - We have investigated the alignment of polyimide backbone structures induced by single oblique angle irradiation with un-polarized light (UP-light) of wavelength 340 ∼ 500 nm. The polyimide (Azo-PI) used in this study contains azobenzene in the backbone structure. The alignment of the backbone structure occurs through random angular rotation of the azobenzene molecule accompanied by its photoinduced trans-cis-trans isomerization. The photo-alignment treatment was performed on 16 nm thick films of polyamic acid (Azo-PAA) that is the precursor of Azo-PI. Subsequently, the Azo-PAA film was thermally imidized. The UP-light exposure was varied up to 882 J/cm2. The orientational distribution of the Azo-PI backbone structure was determined, using polarized infrared absorption spectroscopy. We found that the average inclination angle and the in-plane order parameter of the backbone structure increased with UP-light exposure, reaching 51° from the surface plane and 0.1, respectively, at 882 J/cm2.

KW - Azobenzene

KW - Liquid crystal

KW - Photo-induced alignment

KW - Photo-isomerization

KW - Polarized IR absorption

KW - Polyimide

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SP - 215/[1779]-226/[1790]

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

SN - 1542-1406

ER -

Inclined alignment of polyimide backbone structures induced by single exposure of un-polarized light

Abstract

Keywords

ASJC Scopus subject areas

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