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NAMS 2002 Workshop - ICOM 2008

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<strong>NAMS</strong> Alan S. Michaels Award – 5<br />

Tuesday July 15, 11:10 AM-11:35 AM, Kaua’i<br />

On the Time Scales of Sorption Induced Plasticization<br />

M. Wessling (Speaker), University of Twente, The Netherlands, m.wessling@utwente.nl<br />

This contribution focuses on the phenomenon of sorption induced plasticization.<br />

The term plasticization is frequently used to describe a variety of experimental<br />

observations ranging from for instance (a) time-independent but concentration<br />

dependent diffusion coefficients to (b)very slow (relaxational) changes in volume<br />

dilation and dynamic weight uptake.<br />

The presentation focuses on the plasticization phenomena in three different<br />

polymers: 1. A glassy polyimide (Matrimid) 2. A glassy ionomer (sulphonated<br />

PEEK) 3. A segmented block-copolymer PEBAX<br />

Dynamic sorption studies are carried out for a variety of different gases and<br />

vapors such as noble gases, hydrocarbons and water.<br />

These data are used to reflect on the time-scales of polymer dynamics as<br />

compared to the time-scales of penetrant motion in order to explain plasticization<br />

in rubbery as well as glassy polymers.

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