Sum-frequency generation (SFG) vibrational spectroscopy of side alkyl chain structures of polyimide surfaces

被引：58

作者：

Oh-e, M ^{[1
]}

Lvovsky, AI ^{[1
]}

Wei, X ^{[1
]}

Shen, YR ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2000年 / 113卷 / 19期

关键词：

D O I：

10.1063/1.1318199

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sum-frequency generation (SFG) vibrational spectroscopy was used to study how side alkyl chains of a polyimide are oriented at the air-polymer interface and how they are affected by mechanical rubbing and adsorption of a liquid crystal monolayer. The spectra of polyimides with various alkyl chain lengths all indicate that the chains protrude out of the polyimide surface with a very broad distribution. Longer alkyl chains appear to contain more gauche defects. While the polyimide backbones are aligned by rubbing, the side chain orientation is hardly affected. Adsorption of a liquid crystal monolayer on the surface significantly reduces the gauche defects in the alkyl chains. (C) 2000 American Institute of Physics. [S0021-9606(00)70443-0].

引用

页码：8827 / 8832

页数：6

共 33 条

[1]

[Anonymous], 1984, PRINCIPLES NONLINEAR

[2] Sum frequency generation (SFG)-surface vibrational spectroscopy studies of buried interfaces: catalytic reaction intermediates on transition metal crystal surfaces at high reactant pressures; polymer surface structures at the solid-gas and solid-liquid interfaces [J].