Regensburg 2004 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 14: SYMPOSIUM: Understanding and Controlling Complex Structures: From Synthetic Polymers to Biomaterials II

CPP 14.6: Vortrag

Dienstag, 9. März 2004, 16:00–16:15, H 37

Structural Relaxation and Dynamic Heterogeneity in a Polymer Melt at Attractive Surfaces — •Grant Smith — Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah, USA

Molecular dynamics simulation studies of polymer melts at attractive flat and structured surfaces reveals slowed dynamics and increased dynamic hetergeneity for polymer near the surface. For flat surfaces slow dynamics and increased dynamic heterogeneity of interfacial polymer relative to the bulk was found to be due to densification of the polymer in a surface layer, while for structured surfaces the energy topography of the surface played the dominant role in determining dynamics of interfacial polymer. Much of the dramatic increase in structural relaxation time for the interfacial polymer was found to be the result of dynamic heterogeneity induced by the surfaces.