Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Poster: Colloids and Complex Liquids
CPP 16.8: Poster
Dienstag, 27. März 2012, 18:15–20:45, Poster A
Block Copolymer Agglomerates in a Nematic Liquid Crystal — •Thomas Müller1, Wolfgang Schöpf1, Ingo Rehberg1, Robin Pettau2, Klaus Kreger2, and Hans-Werner Schmidt2 — 1Experimental Physics V, University of Bayreuth, 95440 Bayreuth — 2Macromolecular Chemistry I, University of Bayreuth, 95440 Bayreuth
The suspension of colloidal particles in a nematic liquid crystal solvent can induce local disturbance of the director field. This effect is known from spherical particles like water droplets or gas bubbles which are injected into the liquid crystal host [1, 2]. We investigate a small amount of a side chain liquid crystal triblock copolymer in the nematic liquid crystal 5CB as solvent material. The middle block of the copolymer is 5CB-functionalized and therefore soluble in the anisotropic phase, whereas the non-soluble end blocks can aggregate due to microphase separation. If the resulting agglomerates are big enough, the director deformations in the surrounding birefringent area can be observed with a polarizing microscope. We study the optical properties of a thin layer of this side group liquid crystalline mixture between two glass plates and present a model for the director configuration around the agglomerates. [1] P. Poulin, D. A. Weitz, Phys. Rev. E, 57 (1), 1998; [2] C. Völtz, et al., Phys. Rev. Lett., 97, 227801, 2006