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Proceedings Paper

New photochromic polyimides
Author(s): Ewa Schab-Balcerzak; Beate Sapich; Roland Hass; Joachim Stumpe
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Paper Abstract

A series of new polyesterimides (PEIs) containing photochromic azobenzene moieties have been synthesized. For this purpose the following diesterdianhydrides with azobenzene groups have been prepared: 2,2'-{4-[(4-nitrophenyl)-azo} phenyl]iminobis(ethyl benzene-1,2-dicarboxylic acid anhydride-4-carboxylate), 2,2'-{4-[(4-methylphenyl)-azo}phenyl] iminobis(ethyl benzene-1,2-dicarboxylic acid anhydride-4-carboxylate) and 2,2'-{4-[(4- fluorophenyl)-azo}phenyl] iminobis(ethyl benzene-1,2-dicarboxylic acid anhydride-4-carboxylate). The polyesterimides have been obtained from diesterdianhydrides and 1,3-phenylenediamine using high-temperature polycondensation. The resulting polyimides are characterized as having good solubility in some solvents, high glass transition temperatures (168-210°C) and good film forming properties. The irradiation with linearly polarized light causes a reorientation of the azobenzene groups by angular-selective E/Z photoisomerization. In this way optical anisotropy is induced in the initially isotropic films casting from solution of the amorphous polymers. The photoinduced dichroism in the films has been measured to investigate the effect of azobenzene substitution.

Paper Details

Date Published: 4 April 2005
PDF: 10 pages
Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); doi: 10.1117/12.585015
Show Author Affiliations
Ewa Schab-Balcerzak, Polish Academy of Sciences (Poland)
Beate Sapich, Institute for Thin Film Technology and Microsensorics e.V. (Germany)
Roland Hass, Fraunhofer Institute for Applied Polymer Research (Germany)
Joachim Stumpe, Institute for Thin Film Technology and Microsensorics e.V. (Germany)
Fraunhofer Institute for Applied Polymer Research (Germany)

Published in SPIE Proceedings Vol. 5724:
Organic Photonic Materials and Devices VII
James G. Grote; Toshikuni Kaino; Francois Kajzar, Editor(s)

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