کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5185842 | 1381089 | 2009 | 8 صفحه PDF | دانلود رایگان |
A polybenzimidazole (PBI) containing bulky basic benzimidazole side groups, poly[2,2â²-(2-benzimidazole-p-phenylene)-5,5â²-bibenzimidazole] (BIpPBI), was prepared via the condensation polymerization of 3,3â²-diaminobenzidine tetrahydrochloride dihydrate with 2-benzimidazole terephthalic acid in PPA. BIpPBI was found to be soluble in aprotic polar solvents without the addition of inorganic salts, such as lithium chloride, and the BIpPBI film also showed very good acid retention capability as well as very high proton conductivity. The maximum acid content of the BIpPBI film was approximately 81 wt.% and the proton conductivity value of the acid-doped BIpPBI membrane was 0.16 S cmâ1 at 180 °C and a 0% relative humidity. For comparison, the maximum proton conductivity of the most commonly used polymer for the high-temperature fuel cell membrane, poly[2,2â²-(m-phenylene)-5,5â²-bibenzimidazole] (mPBI) membrane, is approximately 0.06 S·cmâ1 at 180 °C under anhydrous conditions at a 65 wt.% acid content, which is the maximum acid content that a mPBI membrane can have.
Journal: Polymer - Volume 50, Issue 15, 17 July 2009, Pages 3495-3502