Regensburg 2004 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 6: Self-organising Systems
CPP 6.1: Vortrag
Montag, 8. März 2004, 11:30–11:45, H 39
Combinatorial mapping of PS-b-P2VP-b-PtBMA triblock copolymers in thin films — •S. Ludwigs1, K. Schmidt1, R. Magerle1, G. Krausch1, C. Stafford2, M. Fasolka2, A. Karim2, E. Amis2, A. Zvelindovsky3, and A. Sevink3 — 1Physikalische Chemie II, Universität Bayreuth, Bayreuth, Germany — 2NIST Combinatorial Methods Group, Gaithersburg, USA — 3Leiden Institute of Chemistry, Leiden, Netherlands
Using sequential living anionic polymerization we synthesized a series of monodisperse PS-b-P2VP-b-PtBMA triblock copolymers (SVT)with increasing molecular weight of the poly(tert butyl methacrylate) block1. In the present contribution we show experimental results on the thin film behavior of SVT with volume fractions φPS:φP2VP:φPtBMA = 1 : 1.2 : x (with x ranging from 3.05 to 4). Gradients in film thickness were prepared via thin film flow coating of dilute solutions in chloroform. On controlled annealing in a non-selective solvent the films form terraces of well-defined thickness exhibiting a highly ordered perforated lamellar structure. With an additional gradient in substrate surface energy orthogonal to the gradually increasing film thickness we find that the perforated lamellar phase is formed irrespective of the chemical nature of the substrate which makes the structure useful for applications in nanotechnology2. We support our experimental results with simulations based on the dynamic density functional theory: with increasing size of the simulation box we find a similar sequence of structures as in the experiments. 1 S. Ludwigs et al., Polymer 44, 6815 (2003). 2 S. Ludwigs et al., Nature Materials 2, 744 (2003).