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Journal Article

Photoreactive thin films of azobenzene-derivatized poly(amic acid) and poly(imide) Langmuir-Blodgett-Kuhn multilayer assemblies

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Zong,  Y.
MPI for Polymer Research, Max Planck Society;

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Hees,  U.
MPI for Polymer Research, Max Planck Society;

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Knoll,  Wolfgang
MPI for Polymer Research, Max Planck Society;

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Citation

Zong, Y., Hees, U., Knoll, W., & Rühe, J. (2002). Photoreactive thin films of azobenzene-derivatized poly(amic acid) and poly(imide) Langmuir-Blodgett-Kuhn multilayer assemblies. Journal of Nonlinear Optical Physics & Materials, 11(4), 367-389. doi:10.1142/S0218863502001127.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-6488-7
Abstract
Various poly(amic acid)s with azobenzene-chromophore sidegroups have, been synthesized and structurally and functionally characterized. Their amphiphilic properties allowed us to prepare stable monomolecular layers at the water/air interface of a Langmuir trough, and to transfer these highly organized monolayers to solid supports via the Langmuir-Blodgett-Kuhn deposition protocol. The resulting multilayer assemblies were investigated by surface plasmon- and waveguide-optical techniques, by X-ray reflectometry, and by UV-vis and IR spectroscopies. Thermal imidization of the assemblies resulted in functional poly(imide) multilayers that still could undergo photoisomerization reactions in their azobenzene sidegroups. The kinetic parameters of this trans-cis and cis-trans isomerization, respectively, as well as, the resulting control of the alignment of a liquid crystal in contact to these "command layers" were evaluated.