Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 5: SYMPOSIUM: Dynamics of multi-component fluids POSTER

CPP 5.18: Poster

Freitag, 4. März 2005, 17:15–19:00, Poster TU D

Kinetics of ternary polymer blend films investigated with neutron reflectometry and AFM — •P. Panagiotou¹, E. Maurer¹, R. Cubitt², and P. Müller-Buschbaum¹ — ¹TU München Physik Department LS E13, James-Franck-Str. 1, 85747 Garching (Germany) — ²ILL D17, rue Jules Horowitz 1, BP 156 - 38042 Grenoble Cedex 9 - (France)

By blending polymers with different properties in terms of their molecular weight, glass transition temperature and ratio of mixture immiscible new structures are observable. In the present investigation three different polymer components were solved at a given mass concentration in toluene and blended at a specified weight fraction. This polymer solution was spin-coated onto a pre-cleaned Si(100) wafer. By further preparation based on annealing and swelling in solvent vapor the morphology was under kinetic transformations. These kinetic changes of the system have been investigated in-situ with neutron reflectometry (D17 at ILL). With its horizontal plane scattering geometry set-up and its time-of-flight (TOF) mode detection of the specular signal a high time resolution of 60 sec was achieved. During the swelling process the polymer film undergoes a phase separation. The deuterated component diffuses from the substrate towards the surface, while the total thickness of the blend film increases due to the embedded solvent molecules. As three different swelling temperature were investigated the kinetic process was tuned.