Humidity-induced phase transitions in ion-containing block copolymer membranes.
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Date
2008-03-25
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society
Abstract
The phase behavior of ion-containing block copolymer membranes in equilibrium with humidified air is studied as a function of the relative humidity (RH) of the surrounding air, ion content of the copolymer, and temperature. Increasing RH at constant temperature results in both disorder-to-order and order-to-order transitions. In-situ small-angle neutron scattering experiments on the open block copolymer system, when combined with wafer uptake measurement, indicate that the disorder-to-order transition is driven by an increase in the partial molar entropy of the water molecules in the ordered phase relative to that in the disordered phase. This is in contrast to most systems wherein increasing entropy results in stabilization of the disordered phase. © 2008, American Chemical Society
Description
Keywords
Polymers, Polystyrene, Organic compounds, Solvents, Organic polymers, Petroleum products, Hydrophylic polymers, Inorganic polymers
Citation
Park, M. J., Nedoma, A. J., Geissler, P. L., Balsara, N. P., Jackson, A., & Cookson, D. (2008). Humidity-induced phase transitions in ion-containing block copolymer membranes. Macromolecules, 41(6), 2271-2277. doi:10.1021/ma702320t