AN INFRARED SPECTROSCOPIC STUDY OF PHOTOINDUCED REORIENTATION IN DYE CONTAINING LIQUID-CRYSTALLINE POLYMERS

被引:108
作者
WIESNER, U [1 ]
REYNOLDS, N [1 ]
BOEFFEL, C [1 ]
SPIESS, HW [1 ]
机构
[1] MAX PLANCK INST POLYMER RES,ACKERMANNWEG 10,W-6500 MAINZ,GERMANY
关键词
D O I
10.1080/02678299208028986
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Infrared spectroscopy is used to study simultaneously the orientational behaviour of different segments of dye containing liquid-crystalline side group copolymers in sandwich type films of about 2-mu-m thickness. Under continuous irradiation with polarized light above and below T(g) of the polymers both azobenzene and phenyl benzoate side groups reorient preferentially normal to the film plane leading to a strongly biaxial orientation distribution. The analysis of the kinetics reveals that the reorientation is essentially a mono-exponential process with an additional faster process only found for the azobenzene dye and assigned to the initial trans to cis isomerization step. Investigation of an isotropic copolymer system containing azobenzene in the side groups shows that an anisotropy can be induced through irradiation with polarized light that is strongly dependent on temperature.
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页码:251 / 267
页数:17
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