title: Effects of polymer structure on properties of sulfonated polyimide/protic ionic liquid composite membranes for nonhumidified fuel cell applications.
abstract: To investigate the effects of polymer structure on the properties of composite membranes including a protic ionic liquid, [dema][TfO] (diethylmethylammonium trifluoromethanesulfonate), for nonhumidified fuel cell applications, we synthesized sulfonated polyimides (SPIs) with different structures as matrix polymers, which have different magnitudes of ion-exchange capacities (IECs), different sequence distributions of ionic groups, and positions of sulfonate groups in the main chain or side chain. Despite having similar IECs, multiblock copolymer SPI and random copolymer SPI having sulfonate groups in the side chain exhibit higher ionic conductivity than random copolymer SPI having sulfonate groups in the main chain, indicating that the flexibility of sulfonic acid groups and the sequence distribution of ionic groups greatly affect the ion conduction. Atomic force microscopy observation revealed that the multiblock copolymer SPI forms more developed phase separation than the others. These results indicate that the flexibility of sulfonic acid groups and the connectivity of the ion conduction channel, which greatly depends on the sequence distribution, affect the ion conduction.
authors.affiliation: Department of Chemistry and Biotechnology, Yokohama National University, 79-5 Tokiwadai, Yokohama 240-8501, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Yasuda
authors.forename: Shin-ichiro
authors.initials: S
authors.lastname: Nakamura
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Honda
authors.forename: Kei
authors.initials: K
authors.lastname: Kinugawa
authors.forename: Seung-Yul
authors.initials: SY
authors.lastname: Lee
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Watanabe
mesh_terms: D002152:Calorimetry, Differential Scanning; D004553:Electric Conductivity; D004736:Energy-Generating Resources; D006813:Humidity; D007094:Imides / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D011108:Polymers / Q000737:chemistry*; D011522:Protons; D013451:Sulfonic Acids / Q000737:chemistry*; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D007094:Imides; D052578:Ionic Liquids; D008567:Membranes, Artificial; D011108:Polymers; D011522:Protons; D013451:Sulfonic Acids