Levich Institute Seminar Announcement, 05/11/2004

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Tuesday, 05/11/2004
4:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Jan Mewis
K.U. Leuven
Department of Chemical Engineering


"The Flow Behavior Of Associative Polymers "

(This is a CCNY/Columbia NSF-IGERT Soft Materials seminar)

ABSTRACT

Associative polymers deviate from ordinary ones by the presence of groups that cause specific local interactions between chains. The most common representatives of this group consist of water-soluble polymers with two or more hydrophobic groups attached to each molecule. Their aqueous solutions display associative behavior, which is applied in various industrial products. Different associative polymers can display substantial differences in rheological behavior. Yet, a series of nonlinear flow characteristics can be identified that are quite universal for this class of materials whereas they are not encountered in normal polymers. They provide the means to discuss molecular models for associative systems. A transient network, the Marrucci-Vaccaro model, is shown to describe qualitatively all characteristic rheological features of association. On this basis, a physical picture can be sketched of the flow behavior of associative polymers.

BRIEF ACADEMIC/EMPLOYMENT HISTORY:

Jan Mewis got his M.ChemE and PhD from K.U.Leuven. After spending 5 years at the Belgian Paint and Printing Ink Research Institute he returned to teach at K.U.Leuven. He was chairman of the Chemical Engineering Department from 1989 to 1995 and from 1999 until 2002, coordinator of the Safety Engineering Programme from 1982 to 1987, and became emeritus in 2003. After being a visiting professor at the University of Delaware and at Princeton University he is again at Delaware in the same function.

RECENT RESEARCH INTERSTS:

Rheology and processing of suspensions and of polymers with complex microstructure.