TY - JOUR
T1 - Cross-linked poly(2,5-benzimidazole) consisting of wholly aromatic groups for high-temperature PEM fuel cell applications
AU - Kim, Sung Kon
AU - Kim, Tae Ho
AU - Ko, Taeyun
AU - Lee, Jong Chan
PY - 2011/5/1
Y1 - 2011/5/1
N2 - Cross-linked poly(2,5-benzimidazole) (C-ABPBI) membranes consisting of wholly aromatic groups were prepared by a reaction between three-arm poly(2,5-benzimidazole)s with three carboxylic acid end groups (T-ABPBI) and 3,3'-diaminobenzidine (DABI) in poly(phosphoric acid) (PPA) during the casting process. T-ABPBI was prepared by the polymerization of 3,4-diaminobenzoic acid and 1,3,5-benzenetricarboxylic acid in PPA, and the polymerization solution was directly used for the casting process. The cross-linking process improved the chemical stability of the host polymer, poly(2,5-benzimidazole) (ABPBI). The C-ABPBI membranes could contain a larger phosphoric acid (PA) content than the membranes of linear polybezimidazoles, such as ABPBI and poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole]. Consequently, the C-ABPBI membranes showed higher proton conductivity values than the linear polymer membranes. For example, the C-ABPBI-50 membrane could contain a PA content >84wt.% with a proton conductivity of 0.12Scm-1 at 150°C under anhydrous conditions.
AB - Cross-linked poly(2,5-benzimidazole) (C-ABPBI) membranes consisting of wholly aromatic groups were prepared by a reaction between three-arm poly(2,5-benzimidazole)s with three carboxylic acid end groups (T-ABPBI) and 3,3'-diaminobenzidine (DABI) in poly(phosphoric acid) (PPA) during the casting process. T-ABPBI was prepared by the polymerization of 3,4-diaminobenzoic acid and 1,3,5-benzenetricarboxylic acid in PPA, and the polymerization solution was directly used for the casting process. The cross-linking process improved the chemical stability of the host polymer, poly(2,5-benzimidazole) (ABPBI). The C-ABPBI membranes could contain a larger phosphoric acid (PA) content than the membranes of linear polybezimidazoles, such as ABPBI and poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole]. Consequently, the C-ABPBI membranes showed higher proton conductivity values than the linear polymer membranes. For example, the C-ABPBI-50 membrane could contain a PA content >84wt.% with a proton conductivity of 0.12Scm-1 at 150°C under anhydrous conditions.
KW - Cross-linking
KW - Direct casting
KW - Fuel cells
KW - Membranes
KW - Poly(2,5-benzimidazole) (ABPBI)
UR - http://www.scopus.com/inward/record.url?scp=79953739869&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2011.02.039
DO - 10.1016/j.memsci.2011.02.039
M3 - Article
AN - SCOPUS:79953739869
SN - 0376-7388
VL - 373
SP - 80
EP - 88
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1-2
ER -