When Do Sorption-Induced Relaxations in Glassy Polymers Set In?

Visser, T. and Wessling, M. (2007) When Do Sorption-Induced Relaxations in Glassy Polymers Set In? Macromolecules, 40 (14). pp. 4992-5000. ISSN 0024-9297

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Abstract:	This study presents the kinetic sorption behavior of six different gases (CO2, C3H8, C3H6, Xe, Kr, and Ar) in films of the glassy polyimide Matrimid using a magnetic suspension balance. The dynamic mass uptake was analyzed using a model discriminating and quantifying separate contributions of Fickian diffusion and relaxations. The model provides a quantitative insight into the pressure/concentration-dependent onsets and relative magnitudes of sorption-induced relaxations. We demonstrate that any gaseven noble gasesshow non-Fickian diffusion and may induce irreversible sorption relaxations upon reaching a critical amount of volume dilation. Above this critical amount of volume dilation, kinetic sorption behavior becomes non-Fickian. For all gases studied, this critical volume dilation is unique.
Item Type:	Article
Copyright:	ACS
Faculty:	Science and Technology (TNW)
Research Group:	Membrane Science and Technology (MST)
Link to this item:	http://purl.utwente.nl/publications/71623
Official URL:	http://dx.doi.org/10.1021/ma070202g
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