Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Focus: Stress Relaxation in Polymers - From single molecules to biological cells (joint focus with BP)

CPP 32.4: Vortrag

Donnerstag, 29. März 2012, 10:30–10:45, C 243

Stress Induced Single Molecule Reorientation Motion in Elastomeric Polypropylene — •Stefan Krause, Martin Neumann, Melanie Bibrach, Robert Magerle und Christian von Borczyskowski — Fakultät für Naturwissenschaften, TU Chemnitz, D-09107 Chemnitz

The fluorescence of a single molecule (SM) is a very sensitive probe for its environment and changes of the fluorescence lifetime, emission wavelength, and polarization can report spatial and temporal variations in the surrounding structure of the fluorescent dye. Here we report on SM microscopy and spectroscopy studies of stress relaxation in thin films of elastomeric polypropylene (ePP), a semicrystalline polymer with a complex microstructure of crystalline and amorphous regions on the nanometer scale. The films are stretched using a micro tensile testing setup. Simultaneously, perylenediimide dyes functionalized with hexadecane were embedded in the ePP film and report via their molecular dynamics changes within their local environment. Orientation fluctuations were investigated via SM polarization dependent microscopy. This experiment allows for insights into dynamical processes within the amorphous regions of ePP which are not accessible using other microscopy techniques.