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首页> 美国政府科技报告 >Water Uptake Profile In a Model Ion-Exchange Membrane: Conditions For Water-Rich Channels.
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Water Uptake Profile In a Model Ion-Exchange Membrane: Conditions For Water-Rich Channels.

机译：模型离子交换膜中的水吸收曲线：富水通道的条件。

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摘要

Ionic conductivity in a polymeric fuel cell requires water uptake. Previous theoretical studies of water uptake used idealized parameters. We report a parameter-free prediction of the water-swelling behavior of a model fuel cell membrane. The model polymers, poly(methyl- butylene)-block-poly(vinylbenzyl-trimethylamine) (PMB-b- PVBTMA), form lamellar do- mains that absorb water in humid air. We use the Scheutjens-Fleer methodology to predict the resulting change in lamellar structure and compare with x-ray scattering. The results suggest locally uniform water distributions. However, under conditions where a PVBTMA and water mixture phase-separate, the two phases arrange into stripes with a dilute stripe sandwiched between two concentrated stripes. A small amount of water enhances conductivity most when it is partitioned into such channels, improving fuel-cell performance.

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