کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1297172 | 1498370 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Water transport properties of crosslinked-PTFE based electrolyte membranes Water transport properties of crosslinked-PTFE based electrolyte membranes](/preview/png/1297172.png)
We measured the self-diffusion coefficient of water, D, in proton exchange membranes (PEMs) based on crosslinked polytetrafluoroethylene (PTFE) films by a radiotracer-permeation method using tritium labeled water (HTO). When the crosslinking density of the PTFE matrix increased, the D value became smaller. This decreasing trend coincided with that of a water-content parameter, λ, defined as the number of water molecules per sulfonic acid (SO3H) group. According to our proposed model of hydrophilic regions, the relationship between the D and λ indicates that the amount of free water in the crosslinked-PTFE PEMs could be lower than that in the non-crosslinked one, thereby restricting the mobility of water molecules through strong interactions between the majority of water and SO3H groups.
Journal: Solid State Ionics - Volume 179, Issues 27–32, 30 September 2008, Pages 1611–1614