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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.48: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Confinement, Fluctuations, and the Order-Disorder Transition in Diblock Copolymer Melts — •Alfredo Alexander-Katz^1,2 and Glenn H. Fredrickson¹ — ¹Materials Research Laboratory, University of California, Santa Barbara, CA, 93106, USA — ²Department fuer Physik, Ludwig-Maximilians-Universitaet, Theresienstr. 37, D-80333 Munich, Germany

Using field-theoretic simulations, we study the effects of confinement and fluctuations in the location of the order-disorder transition (ODT) for a diblock copolymer system. Specifically, we consider a melt of copolymers confined between two neutral hard walls separated by a distance L. For this system, it is found that confinement induces a shift in the ODT which depends on the strength of the fluctuations (dominated by the length of the copolymers), as well as on the width of the slit. The shift in the ODT due to fluctuations presents a minimum when the slit width is comparable to the unperturbed size of the polymer. Also, we present results on the structure of the disorder phase close to the ODT which exhibits non-trivial oscillations in the composition fluctuations.