Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 17: Thin Films and Surfaces II
CPP 17.1: Vortrag
Mittwoch, 29. März 2006, 15:45–16:00, ZEU Lich
Self assembly of diblock copolymers on patterned substrates: A Single Chain in Mean Field simulation study — •Kostas Daoulas1, Marcus Mueller1, Mark Stoykovich2, Sang-Min Park2, Yioryos Papakonstantopoulos2, Juan de Pablo2, and Paul Nealey2 — 1Institut fuer Theoretische Physik, Georg August Universitaet, D37077 Goettingen — 2Department of Chemical and Biological Engineering, University of Wisconsin, Madison, WI 53706-1691
The implementation of a recently developed Single Chain in Mean Field (SCMF) method is presented, to study the self assembly of a lamella-forming ternary blend of a diblock-copolymer with its respective homopolymers on periodically patterned substrates. The pattern consists of square arrays of spots preferentially attracting one component and the structure of the assembled blend is investigated as a function of pattern dimensions and film thickness. The SCFM simulations show that the blend morphology closely follows the pattern at the substrate forming a quadratically perforated lamella (QPL). Depending on the pattern dimensions, the QPL is connected to the film free surface either through cylindrical-like necks or lamellae-like domains, resulting in a bicontinuous morphology. The theoretical predictions concerning the structure observed on the free surface of the film are in accordance with experimental data obtained for the same systems.