Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: Nanoparticles and Composite Materials
CPP 2.3: Vortrag
Montag, 26. März 2012, 10:00–10:15, C 243
Diblock Copolymer - Selective Nanoparticle Mixture in Lamellar Phase Confined between two Parallel Walls : A Mean Field Model — •Lenin Singh Shagolsem1,2 and Jens-Uwe Sommer1,2 — 1Leibniz Institute of Polymer Research Dresden, Dresden, Germany — 2Institute of Theoretical Physics, TU Dresden, Dresden, Germany
We present a mean field model for a mixture of AB diblock-copolymers and A-block selective nanoparticles confined between two identical non-selective walls. A horizontally symmetric lamellar structure of the nanocomposite is considered. For a given nanoparticle volume fraction, φ, and wall separation, L, we study the change in the free energy as a function of the number of lamellar layers, p, and the nanoparticle uptake of the polymer film, y=φ x, where 0≤ x≤ 1. We observe that there exists a particular p which is commensurable with the given film thickness. At small values of y, the equilibrium-uptake is mainly controlled by the balance of stretching, and the interaction between monomers and nanoparticles . We find that the equilibrium value of y is independent of φ and increase sub-linearly with monomer-nanoparticle interaction strength. In addition, we also consider A-block selective walls. Here, we investigate the non-wetting/wetting transition and constructed a corresponding phase diagram.