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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Biomathematics Seminar: Elasticity dominated surface segregation of small molecules in polymer mixtures

Presented by Jarek Krawczyk, Durham University

24 November 2015 14:00 in CM105

We study the phenomenon of migration of the small molecular weight component of a binary
polymer mixture to the free surface using mean field and self-consistent field theories. By proposing a
free energy functional that incorporates polymer-matrix elasticity explicitly, we compute the migrant
volume fraction and show that it decreases significantly as the sample rigidity is increased. Estimated
values of the bulk modulus suggest that the effect should be observable experimentally for rubber-
like materials. This provides a simple way of controlling surface migration in polymer mixtures
and can play an important role in industrial formulations, where surface migration often leads to
decreased product functionality.

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