Graduate School in Nonlinear Science

Sponsored by the Danish Research Academy

MIDIT                               OFD                           CATS
Modelling, Nonlinear Dynamics       Optics and Fluid Dynamics     Chaos and Turbulence Studies
and Irreversible Thermodynamics     Risø National Laboratory      Niels Bohr Institute and 
Technical University of Denmark     Building 128                  Department of Chemistry
Building 321                        P.O. Box 49                   University of Copenhagen 
DK-2800 Lyngby                      DK-4000 Roskilde              DK-2100 Copenhagen Ø
Denmark                             Denmark                       Denmark


by Prof. M. Laradji
Department of Physics,
University of Prince Edward Island,

Thursday August 13, 1998, 15.15 h (Coffee at 15.00)
at Department of Chemistry, Building 206, room 250

Abstract: The elastic properties of homopolymer-homopolymer interfaces containing diblock copolymers are investigated by means of self-consistent theory of anisotropic fluctuations. We will show that in the limiting case of a pure binary homopolymer mixture, while the interfacial tension increases monotonically with increasing X N (X is the Flory-Huggins parameter, N is the homopolymer molecular wieigh), the bending rigidity increses rapidly for small values of X N, but then decreases for further increase of X N. In the presence of diblock copolymers, the interfacial tension always decreases with increasing diblock copolymer volume fraction at a given X N, however, the bending rigidity can show either a decrease or an increase. We will further compare our results with results based on scaling arguments for wet polymer brushes.