Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Poster: Semicrystalline Polymers, Polymer Crystallization and Self-Assembly
CPP 23.6: Poster
Dienstag, 15. März 2011, 18:00–20:00, P2
Increasing the disorder-order transition temperature in PS-P2VP diblock copolymers by applying strong electric fields — •Ilja Gunkel and Thomas Thurn-Albrecht — Institute of Physics, Martin Luther University Halle Wittenberg, Halle, Germany
We present temperature-dependent in-situ small-angle X-Ray scattering measurements on symmetric polystyrene-block-poly-2-vinylpyridine (PS-P2VP) diblock copolymer melts in the presence of an electric field. We found that an electric field favors the ordered state in diblock copolymer melts as the temperature of the disorder-order transition (TDOT) was increased by 1 ∘C in the presence of electric fields with 30 V/µm. This result qualitatively agrees with recent theoretical predictions on the shift of TDOT in electric fields where it was shown that applying an electric field suppresses composition fluctuations thus leading to an increase of the disorder-order transition temperature [1]. However, in concentrated solutions of symmetric PS-PI in toluene TDOT was found to decrease in the presence of electric fields [2]. These different results will be compared and discussed.
[1] Gunkel, I.; Stepanow, S.; Trimper, S.; Thurn-Albrecht, T. Macromolecules 2007, 40 (6), 2186-2191
[2] Schoberth, H. G.; Schmidt, K.; Schindler, K. A.; Boker, A. Macromolecules 2009, 42 (10), 3433-3436.