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Light-induced properties in polyimides containing side azobenzene groups

: Sava, I.; Bruma, M.; Schulz, B.; Stumpe, J.


National Institute for Research and Development in Microtechnologies, Bucharest:
International Semiconductor Conference, CAS 2006. Vol. 2
Piscataway, NJ: IEEE Operations Center, 2007
ISBN: 1-424-40109-7
International Semiconductor Conference <29, 2006, Sinaia/Romania>
Conference Paper
Fraunhofer IAP ()

A series of new photosensitive polymers have been synthesized by polycondensation reaction of diamines containing azobenzene moieties with hexafluoroisopropylidene diphthalic anhydride or with a diacid chloride containing hexafluoroisopropylidene or dimethylsilane. These amorphous polymers have good solubility in organic solvents and good film forming properties. The irradiation of polymer films with linearly polarized UV-Vis light causes a reorientation of the azobenzene groups by angular-selective E/Z photoisomerization. Thus, optical anisotropy is induced in the initially isotropic films. The photoinduced dichroism in the films has been measured and the results are discussed with respect to the polymer structure.