Journal
POLYMER
Volume 51, Issue 16, Pages 3784-3792Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2010.06.004
Keywords
Physical aging; Gas permeability; Membranes
Categories
Funding
- Air Liquide/MEDAL
- National Science Foundation Science and Technology Center for Layered Polymeric Systems [DMR-0423914]
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The physical aging behavior of thin glassy polysulfone (PSF) films (similar to 125 nm) with different previous histories was tracked using gas permeability measurements. The initial states of these materials were modulated by thermal annealing at fixed temperatures below the glass transition or by exposure to high pressure (800 psig (56.2 bara)) CO(2) for various times. Regardless of the previous history, the nature of the aging response in these samples was consistent with the aging behavior of an untreated film that was freshly quenched from above T(g), i.e., permeability decreased and pure gas selectivity increased with aging time. However, the extent of aging-induced changes in transport properties of these materials depended strongly on previous history. The aging behavior was described using Struik's aging model by allowing the initial conditions to depend on each sample's previous history. (C) 2010 Elsevier Ltd. All rights reserved.
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