TY - GEN
T1 - Synthesis and properties of polybenzimidazole with benzimidazole pendant for high-temperature fuel cell applications
AU - Kim, Sung Kon
AU - Kim, Tae Ho
AU - Jung, Jung Woo
AU - Chung, Jae Seung
AU - Lee, Jong Chan
PY - 2009
Y1 - 2009
N2 - A polybenzimidazole (PBI) containing bulky basic benzimidazole side groups, poly[2,2′-(2-benzimidazole-p-phenylene)-5,5′-bibenzimidazole] (BIpPBI), was prepared via the condensation polymerization of 3,3′-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•cm-1 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[2,2′-(m-phenylene)-5,5′-bibenzimidazole] (mPBI) membrane, is approximately 0.06 S′cm-1 at 180 °C under anhydrous conditions at a 65 wt.% acid content, which is the maximum acid content that a mPBI membrane can have.
AB - A polybenzimidazole (PBI) containing bulky basic benzimidazole side groups, poly[2,2′-(2-benzimidazole-p-phenylene)-5,5′-bibenzimidazole] (BIpPBI), was prepared via the condensation polymerization of 3,3′-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•cm-1 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[2,2′-(m-phenylene)-5,5′-bibenzimidazole] (mPBI) membrane, is approximately 0.06 S′cm-1 at 180 °C under anhydrous conditions at a 65 wt.% acid content, which is the maximum acid content that a mPBI membrane can have.
UR - http://www.scopus.com/inward/record.url?scp=78649769042&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:78649769042
SN - 9780841200050
T3 - ACS National Meeting Book of Abstracts
BT - American Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
T2 - 238th National Meeting and Exposition of the American Chemical Society, ACS 2009
Y2 - 16 August 2009 through 20 August 2009
ER -