Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Poster: Polymer Dynamics
CPP 18.5: Poster
Dienstag, 12. März 2013, 18:15–20:15, Poster C
Analysis of polymer flow in nanopores with time-resolved SAXS — •Manuela Lukas and Bernd Stühn — Experimental Condensed Matter Physics, TU Darmstadt, Germany
The flow of polymers due to capillary pressure in nanopores is investigated. Polycarbonate samples are irradiated with swift heavy ions, treated with UV light and etched in NaOH solution. The nanopores are aligned strictly parallel and examined by Small-Angle X-ray Scattering (SAXS). To observe the filling behavior, time resolved SAXS measurements are performed at different temperatures.
Polydimethylsiloxane was chosen with different molecular weights. With different radii of gyration and various pore diameters a wide range of Rg/D is considered.
The filling process is shown by the steady decrease in scattering intensity with time. The whole scattering curves are fitted at every time step. It ist thus possible to analyse change of intensity and form factor with time.
The intensity variation with time follows the Lucas-Washburn equation. The √(t) -dependency of the filling height is reproduced well throughout the whole filling process.
The current aim is to determine the factors that influence flow behavior in nanopores.