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Water uptake profile in a model ion-...

Herbst, Daniel C.

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Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels./
作者:	Herbst, Daniel C.
面頁冊數:	82 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-05(E), Section: B.
Contained By:	Dissertation Abstracts International76-05B(E).
標題:	Theoretical physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3668256
ISBN:	9781321432466

Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.
Herbst, Daniel C.

Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels. - 82 p.

Source: Dissertation Abstracts International, Volume: 76-05(E), Section: B.

Thesis (Ph.D.)--The University of Chicago, 2014.

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 domains 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.

ISBN: 9781321432466Subjects--Topical Terms:

2144760
Theoretical physics.

Water uptake profile in a model ion-exchange membrane: Conditions for water-rich channels.
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520 $a 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 domains 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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