Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster: Stress Relaxation in Polymers - From single molecules to biological cells (joint focus with BP)

CPP 25.3: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Synthesis and spectroscopic characterization of BODIPY dyes with aliphatic substituents in polymer matrices — •Melanie Bibrach, Stefan Krause, Christian von Borczyskowski, and Robert Magerle — TU Chemnitz, Fakultät für Naturwissenschaften, D-09126 Chemnitz

Boron dipyrrin (BODIPY) derivates are popular dyes for single molecule spectroscopy because of their high photoefficency and photostability. We aim at using BODIPY labelled polymers as fluorescent probes for the macromolecular dynamics in polypropylene and other semicrystalline polymers that is caused by relaxation of mechanical stress. To this end we synthesized BODIPY derivates with aliphatic substituents of different length from precursor molecules via the Heck reaction. Here we report on their spectroscopic characterization on the ensemble level. The fluorescent probes were embedded in thin films of different polymers (polypropylenes, block copolymers). Fluorescence spectra and fluorescence lifetime were measured in the temperature range from -50 °C to 160 °C. We discuss our results with respect to structural and dynamic changes of the polymers, such as glass transition and cystallisation.