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Complex Flow of Nanoconfined Polymers

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Date and time Nov 02, 2006
from 04:10 PM to 05:00 PM
Location McLennan Physics (MP) 102
Host Rashmi Desai

John Dutcher, Department of Physics, University of Guelph

The motion of long chain polymer molecules occurs on a variety of length scales, ranging from segmental relaxation to the motion of entire chains. The effect on molecular mobility of confining the molecules to thin films is of great interest for both fundamental reasons, such as achieving an understanding of the glass transition and testing the tube theory of polymer dynamics, and practical reasons, such as the improvement of polymer coatings, adhesives and lubricants and the use of polymer films in novel applications. I will discuss our recent studies of instabilities that are inherent to freely-standing ultrathin polymer films at elevated temperatures. Formation and growth of holes in single freely-standing polystyrene films provides us with a unique window on nonlinear flow processes for the nanoconfined polymers. Heating of freely-standing polymer trilayer films consisting of a polyisoprene layer symmetrically capped by two polystyrene layers leads to a novel form of pattern formation and film rupture.

Dutcher image

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MP3 recording of talk
PPT presentation file (with voice synchronization)

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Contact Name Rashmi Desai
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