Thu, 21 Aug 2008 15:25:22 BST CiteULike: rbgrubbs Cookson http://www.citeulike.org/user/rbgrubbs/author/Cookson CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/rbgrubbs/article/2795493 <i>Macromolecules, Vol. 41, No. 6. (25 March 2008), pp. 2271-2277.</i><br /><br />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 water 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. Humidity-Induced Phase Transitions in Ion-Containing Block Copolymer Membranes MJ Park AJ Nedoma PL Geissler NP Balsara A Jackson D Cookson doi:10.1021/ma702320t Macromolecules, Vol. 41, No. 6. (25 March 2008), pp. 2271-2277. 2008-05-13T15:43:01-00:00 2008 Macromolecules 41 6 2271 2277 bcp responsive structure