Viscoelastic response of diblock copolymers to oscillatory shear
Physikalisches Institut, Universität Bayreuth, 95440, Bayreuth, Germany
* e-mail: email@example.com
Accepted: 16 February 2005
Published online: 22 March 2005
A mesoscopic model for diblock copolymers is combined with a simple rheological description of the viscoelastic contrast of its two phases. Under oscillatory shear the contrast generates secondary velocity fields and substantial deviations of volume-averaged flow parameters. The validity of our analytical findings is tested with three-dimensional numerical simulations. Furthermore, we consider the effect of advection by the generated flows on the stability of ordered lamellar states and propose a new criterion for the selection of orientations.
PACS: 83.80.Uv Block copolymers – / 47.50.+d Non-Newtonian fluid flows – / 47.54.+r Pattern selection; pattern formation –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2005