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Polarized Light-Induced Anisotropy in Polymer Films Doped with Az Dyes in the Photostationary State Studied by IR Spectroscopy

Published online by Cambridge University Press:  10 February 2011

K. Tawa ,
K. Kamada ,
T. Sakaguchi  and
K. Ohta
K. Tawa
Affiliation:
Fields and Reactions, PRESTO, JST and Osaka National Research Institute, 1–8–31 Midorigaoka, Ikeda, Osaka 563, JAPAN, [email protected]
K. Kamada
Affiliation:
Osaka National Research Institute, 1–8–31 Midorigaoka, Ikeda, Osaka 563, JAPAN
T. Sakaguchi
Affiliation:
Osaka National Research Institute, 1–8–31 Midorigaoka, Ikeda, Osaka 563, JAPAN
K. Ohta
Affiliation:
Fields and Reactions, PRESTO, JST and Osaka National Research Institute, 1–8–31 Midorigaoka, Ikeda, Osaka 563, JAPAN, [email protected]
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Abstract

The anisotropy induced in a series of methacrylate polymers doped with Disperse Orange 3 (DO3, NO2-phenyl-N=N-phenyl-NH2) was investigated by polarized FTIR spectroscopy. Three kinds of methacrylate polymers with different glass transition temperature (Tg), poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA), and poly(butyl methacrylate) (PBMA), were used as polymer matrices. Observed infrared absorption bands of DO3 in the polymer films were assigned to symmetric (NO2s) and antisymmetric (NO2as) stretching modes of NO2, and the C-N stretching mode of C-NH2 (C-N). The infrared dichroism was observed in these bands under the irradiation. The orientation factors, Kzfn, (f=x, y, z, n=trans, cis), for both isomers of DO3 were determined in the photostationary stite for every polymer matrix. The factors indicate that it is difficult for NO2 group to move in the PMMA during trans-cis-trans isomerization and that it is difficult for NH2 group to move in the PBMA. The dynamical behavior of DO3 molecules which depends on the kind of polymers could be interpreted from orientation factors. This study shows that polarized FTIR spectroscopy is one of the most powerful methods available to analyze the physical mechanisms of photoinduced anisotropy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 885
Copyright
Copyright © Materials Research Society 1998

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