MOLECULAR-ORIENTATION OF POLYIMIDE FILMS FOR LIQUID-CRYSTAL ALIGNMENT STUDIED BY INFRARED DICHROISM

被引：53

作者：

SAWA, K ^{[1
]}

SUMIYOSHI, K ^{[1
]}

HIRAI, Y ^{[1
]}

TATEISHI, K ^{[1
]}

KAMEJIMA, T ^{[1
]}

机构：

[1] NEC CORP LTD,FUNCT DEVICES RES LAB,KAWASAKI,KANAGAWA 216,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1994年 / 33卷 / 11期

关键词：

LIQUID CRYSTAL; MOLECULAR ORIENTATION; POLYIMIDE; RUBBING PROCESS; INFRARED DICHROISM;

D O I：

10.1143/JJAP.33.6273

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An orientation structure of polyimide film, which is introduced by rubbing in liquid crystal device (LCD) fabrication, is clarified by polarized infrared spectroscopy. Samples rotated in-plane around the polarized incident beam reveal that the orientation direction of the rubbed polymer chain coincides with the rubbing direction. A sample-tilt measurement, in which the sample is tilted around the vertical axis, reveals that the polymer chains are tilted at an angle to the substrate surface. A simple model is proposed in order to estimate the thickness of the oriented layer of the rubbed film. In the model, the degree of dichroism of parallel and perpendicular polarized IR spectra is calculated as a function of polymer him thickness. Comparing the model with experimental data, it is determined that the thickness of the oriented layer is less than 14 nm.

引用

页码：6273 / 6276

页数：4

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