Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Polymer Physics IV: Thin Films

CPP 13.8: Vortrag

Dienstag, 27. März 2007, 16:45–17:00, H40

Manipulation of smectic layers thickness in smectic elastomers by means of uniaxial stretching — •Victor Aksenov¹, Martin Rössle², Ralf Stannarius¹, and Rudolf Zentel² — ¹Otto-von-Guericke-Universität Magdeburg, Institut für Experimentelle Physik, Universitätsplatz 2, D-39106 Magdeburg — ²Universität Mainz, Institut für Organische Chemie, Duesbergweg 10-14, D-55099 Mainz

The deformations of thin oriented films of smectic liquid crystal elastomers (LCE) have been studied on macroscopic and microscopic levels by small angle x-ray scattering (SAXS), optical reflectometry and polarized Fourier transform infrared (FTIR) spectroscopy [1, 2, 3] The polymeric network couples the microscopic characteristics such as director orientation and order parameter to the macroscopic dimensions of LCEs. For the material investigated in this work, it has been found that during stretching of free standing films with smectic layers parallel to the film surface, the optical thickness of the sample changes [1]. Small angle X-ray scattering (SAXS) measurements revealed the compression of the smectic layers in the SmA and SmC* phases [1]. The deformation induced tilt measured by polarized FTIR spectroscopy [3] is too small to explain the compression of the smectic layers.

[1] V. Aksenov, J. Bläsing, R. Stannarius, M. Rössle, and R. Zentel, 2005, Liquid Crystals, 32, No. 7, 805-813. [2] R. Stannarius, V. Aksenov, J. Bläsing, A. Krost, M. Rössle and R. Zentel, Phys. Chem. Chem. Phys., 2006, 8, 2293-2298. [3] V. Aksenov et al. 2008, Liquid Crystals (In press).