کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1290494 | 973328 | 2010 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Proton exchange membranes based on semi-interpenetrating polymer networks of fluorine-containing polyimide and Nafion® Proton exchange membranes based on semi-interpenetrating polymer networks of fluorine-containing polyimide and Nafion®](/preview/png/1290494.png)
A series of reinforced composite membranes as proton exchange membranes were prepared from Nafion®212 and crosslinkable fluorine-containing polyimides (FPI). FPI was prepared from the polymerization of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (TFMB), and 3,5-diaminobenzoic acid (DABA). Then FPI was thermally crosslinked during the membrane preparation and formed the semi-interpenetrating polymer networks (semi-IPN) structure in the composite membranes. The thermal properties of the composite membranes were characterized by thermogravimetric analysis. The crosslinking density of FPI in the composite membranes was evaluated by the gel fraction. These membranes showed excellent thermal stabilities and good oxidative stabilities. Compared with Nafion®212, the obtained composite membranes displayed much improved mechanical properties and dimensional stabilities. The tensile strength of the composite membranes was more than twice that of Nafion®212. The composite membranes exhibited high proton conductivity, which ranged from 2.3 × 10−2 S cm−1 to 9.1 × 10−2 S cm−1. All membranes showed an increase in proton conductivity with temperature elevation.
Journal: Journal of Power Sources - Volume 195, Issue 10, 15 May 2010, Pages 3077–3083