DETERMINATION OF ORIENTATIONAL ORDER PARAMETERS OF UNIAXIAL FILMS WITH A COMMERCIAL 90-DEGREES-ANGLE FLUORESCENCE SPECTROMETER

被引:19
作者
DAMERAU, T
HENNECKE, M
机构
[1] Bundesanstalt für Materialforschung und-prüfung, 12205 Berlin
关键词
D O I
10.1063/1.470450
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
A method is developed to determine orientational order parameters [P-2] and [P-4] of films by steady state fluorescence polarization in a spectrometer with 90 degrees angle between excitation and emission beam. This is the geometry usually found in commercial fluorescence spectrometers. The method includes the determination of the fundamental molecular anisotropy r(M) of the fluorescent chromophore (doped or intrinsic) in stretched and unstretched films and the determination of instrumental correction coefficients from an isotropic him. As an example, the method is applied to orientation analysis of polyethylene and polystyrene films doped with fluorescent molecules of repetitive styrene units. It is concluded that in uniaxially stretched polyethylene-films orientation of these molecules is dominated by their molecular shape; in polystyrene films orientation is influenced by additional interactions. (C) 1995 American Institute of Physics.
引用
收藏
页码:6232 / 6240
页数:9
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