Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: POSTERS Electronic and Optical Properties
CPP 40.1: Poster
Donnerstag, 26. März 2009, 17:00–19:30, P3
Optimization of the Photochromic Response of Photo-Addressable Polymers with Azobenzene-Containing Molecular Glasses — •Hubert Audorff1, Lothar Kador1, Roland Walker2, and Hans-Werner Schmidt2 — 1University of Bayreuth, Institute of Physics and BIMF, D-95440 Bayreuth, Germany — 2University of Bayreuth, Macromolecular Chemistry I and BIMF, D-95440 Bayreuth, Germany
A new series of photochromic molecular glasses has been synthesized and investigated as blending materials for improving the photochromic response of photoaddressable diblock copolymers. We performed a detailed study of the optical properties of the new materials in correlation with their structural properties. Various end groups as well as different core compounds are employed to achieve a combination of high thermal stability, good sensitivity, and high refractive index modulation. To obtain a better understanding of the photochromic response behavior of our materials, we performed the holographic experiments under a variety of conditions, e.g. at elevated temperatures and on blends with polystyrene and an azobenzene-containing homopolymer. In a blend of the molecular glass with polystyrene, 20 plane-wave holograms were recorded at the same spot by angular multiplexing. By doping the photochromic molecular glass into photoaddressable diblock copolymers, we accomplished an increase of the comparably low sensitivity of the latter, which is the biggest drawback of polymer materials. To increase the sensitivity even further, the holographic grating can be inscribed at elevated temperatures.