Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Poster: Polymer Dynamics
CPP 18.9: Poster
Dienstag, 12. März 2013, 18:15–20:15, Poster C
Growth process of monodisperse cylindrical polymer micelles measured by SAXS, DLS and TEM — •Christina Lederle1, Johannes Elbert2, Markus Gallei2, Matthias Rehahn2, and Bernd Stühn1 — 1Experimental Condensed Matters Physics, TU Darmstadt, Germany — 2Makromolekulare Chemie, TU Darmstadt, Germany
Cylindrical micelles are grown on the basis of seeds formed by aggregates of the block copolymer polyferrocenylsilane-b-poly(dimethylsiloxane) (PFS-b-PDMS) in hexane (selective for the second block). The seeds were produced by 4 hours sonication. Adding a second block copolymer (Polyisoprene-b-PFS) in Tetrahydrofurane (good solvent for both blocks) to these seeds cylindrical micelles are grown. Their length depends on the addition of a specified amount of PI-b-PFS in THF.
We study these aggregates with Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM). TEM - pictures show a big length difference between PFS-b-PDMS seeds after applied 4 hours sonication (40 - 60 nm) and grown cylinders (200 nm - 1000 nm). Diffusion coefficients, measured by DLS, decrease with increasing addition of further chains. Furthermore we observe the growth process via measured intensity in light scattering experiments, started from seeds and added PI-b-PFS in solution during the measurement. The intensity increases until a plateau appears after days.
We plan to orientate those grown cylinders in solution via application of an electric field and measure its effect by SAXS.