# 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
**

**ELASTIC PROPERTIES OF HOMOPOLYMER-HOMOPOLYMER INTERFACES CONTAINING
DIBLOCK COPOLYMERS**

by** Prof. M. Laradji**

Department of Physics,

University of Prince Edward Island,

Canada

**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.