INVESTIGATION OF LIQUID-CRYSTAL ALIGNMENT ON POLYBUTYLMETHACRYLATE SURFACES USING FTIR-ATR AND XPS

被引：8

作者：

THOMAS, EA ^{[1
]}

ZUPP, TA ^{[1
]}

FULGHUM, JE ^{[1
]}

FREDLEY, DS ^{[1
]}

WEST, JL ^{[1
]}

机构：

[1] KENT STATE UNIV,DEPT CHEM,KENT,OH 44242

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1994年 / 250卷

关键词：

ALIGNMENT LAYERS; POLYBUTYLMETHACRYLATES; XPS; FTIR-ATR;

D O I：

10.1080/10587259408028206

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Conoscopy studies have shown that poly(n-butylmethacrylate) (PNBMA) causes LC molecules to align homogeneously (parallel alignment) to the surface while poly(iso-butylmethacrylate) (PIBMA) causes LC molecules to align homeotropically (perpendicular alignment) to the surface. This alignment switch occurs when the polymer composition is greater than 40% PIBMA. Fourier transform infrared-attenuated total reflectance (FTIR-ATR) analyses have been done to examine the chemical interactions occurring at the polymer/LC interface as a function of substrate composition. No unique peaks are present in the FTIR spectra for the LC/polymer interface, yet there are subtle differences in peak shape, position, or intensity. These polymer substrates have also been examined by X-ray photoelectron spectroscopy (XPS), using valence band spectra to determine the surface composition. The XPS studies indicate that mixtures of PIBMA and PNBMA are enriched in PIBMA at the surface.

引用

页码：193 / 208

页数：16

共 17 条

[1] LEAST-SQUARES CURVE-FITTING OF FOURIER-TRANSFORM INFRARED-SPECTRA WITH APPLICATIONS TO POLYMER SYSTEMS [J].