Humidity-Induced Phase Transitions in Ion-Containing Block Copolymer Membranes

by: MJ Park, AJ Nedoma, PL Geissler, NP Balsara, A Jackson, D Cookson

Macromolecules, Vol. 41, No. 6. (25 March 2008), pp. 2271-2277.

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DOI, American Chem. Soc. Publications

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Abstract

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.

@article{citeulike:2795493, abstract = {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.}, address = {Australian Synchrotron Research Program, Bldg 343, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439}, author = {Park, M. J. and Nedoma, A. J. and Geissler, P. L. and Balsara, N. P. and Jackson, A. and Cookson, D. }, citeulike-article-id = {2795493}, doi = {10.1021/ma702320t}, journal = {Macromolecules}, keywords = {bcp, responsive, structure}, month = {March}, number = {6}, pages = {2271--2277}, posted-at = {2008-05-13 16:43:23}, priority = {2}, title = {Humidity-Induced Phase Transitions in Ion-Containing Block Copolymer Membranes}, url = {http://dx.doi.org/10.1021/ma702320t}, volume = {41}, year = {2008} }

RIS record

TY - JOUR ID - citeulike:2795493 L3 - citeulike-article-id:2795493 TI - Humidity-Induced Phase Transitions in Ion-Containing Block Copolymer Membranes JF - Macromolecules VL - 41 IS - 6 SP - 2271 EP - 2277 AD - Australian Synchrotron Research Program, Bldg 343, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 N2 - 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. KW - bcp KW - responsive KW - structure AU - Park, MJ AU - Nedoma, AJ AU - Geissler, PL AU - Balsara, NP AU - Jackson, A AU - Cookson, D PY - 2008/03/25/ UR - http://dx.doi.org/10.1021/ma702320t ER -

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