WO2008038162-A2  DALETOU M K ET AL: "Proton conducting membranes based on blends of PBI with aromatic polyethers containing pyridine units" JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, vol. 252, no. 1-2, 1 January 2003 (2003-01-01), pages 115-122, XP009103762 ISSN: 0376-7388;  GOURDOUPI, N. ET AL: "Novel Proton - Conducting Polyelectrolyte Composed of an Aromatic Polyether Containing Main-Chain Pyridine Units for Fuel Cell Applications" CHEMISTRY OF MATERIALS , 15(26), 5044-5050 CODEN: CMATEX; ISSN: 0897-4756, 2003, XP002495313;  JANG ET AL: "Acid-base polyimide blends for the application as electrolyte membranes for fuel cells" 1 September 2006 (2006-09-01), JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, PAGE(S) 321 - 329 , XP005544281 ISSN: 0376-7388 conclusion, Figure 1;  PEFKIANAKIS, ELEFTERIOS K. ET AL: "Novel polymer electrolyte membrane , based on pyridine containing poly(ether sulfone), for application in high-temperature fuel cells" MACROMOLECULAR RAPID COMMUNICATIONS , 26(21), 1724-1728 CODEN: MRCOE3; ISSN: 1022-1336, 2005, XP002495312 cited in the applicationWO2008038162-A3  PEFKIANAKIS, ELEFTERIOS K. ET AL: "Novel polymer electrolyte membrane , based on pyridine containing poly(ether sulfone), for application in high-temperature fuel cells" MACROMOLECULAR RAPID COMMUNICATIONS , 26(21), 1724-1728 CODEN: MRCOE3; ISSN: 1022-1336, 2005, XP002495312 cited in the application;  GOURDOUPI, N. ET AL: "Novel Proton - Conducting Polyelectrolyte Composed of an Aromatic Polyether Containing Main-Chain Pyridine Units for Fuel Cell Applications" CHEMISTRY OF MATERIALS , 15(26), 5044-5050 CODEN: CMATEX; ISSN: 0897-4756, 2003, XP002495313;  JANG ET AL: "Acid-base polyimide blends for the application as electrolyte membranes for fuel cells" 1 September 2006 (2006-09-01), JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, PAGE(S) 321 - 329 , XP005544281 ISSN: 0376-7388 conclusion, Figure 1;  DALETOU M K ET AL: "Proton conducting membranes based on blends of PBI with aromatic polyethers containing pyridine units" JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, vol. 252, no. 1-2, 1 January 2003 (2003-01-01), pages 115-122, XP009103762 ISSN: 0376-7388;  PEFKIANAKIS, ELEFTERIOS K. ET AL: "Novel polymer electrolyte membrane , based on pyridine containing poly(ether sulfone), for application in high-temperature fuel cells", MACROMOLECULAR RAPID COMMUNICATIONS , 26(21), 1724-1728 CODEN: MRCOE3; ISSN: 1022-1336, 2005, XP002495312;  GOURDOUPI, N. ET AL: "Novel Proton - Conducting Polyelectrolyte Composed of an Aromatic Polyether Containing Main-Chain Pyridine Units for Fuel Cell Applications", CHEMISTRY OF MATERIALS , 15(26), 5044-5050 CODEN: CMATEX; ISSN: 0897-4756, 2003, XP002495313;  JANG ET AL: "Acid-base polyimide blends for the application as electrolyte membranes for fuel cells", 1 September 2006, JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, PAGE(S) 321 - 329, ISSN: 0376-7388, XP005544281;  DALETOU M K ET AL: "Proton conducting membranes based on blends of PBI with aromatic polyethers containing pyridine units", JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. 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ET AL: "Novel Proton - Conducting Polyelectrolyte Composed of an Aromatic Polyether Containing Main-Chain Pyridine Units for Fuel Cell Applications" CHEMISTRY OF MATERIALS , 15(26), 5044-5050 CODEN: CMATEX; ISSN: 0897-4756, 2003, XP002495313;  JANG ET AL: "Acid-base polyimide blends for the application as electrolyte membranes for fuel cells" 1 September 2006 (2006-09-01), JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, PAGE(S) 321 - 329 , XP005544281 ISSN: 0376-7388 conclusion, Figure 1;  DALETOU M K ET AL: "Proton conducting membranes based on blends of PBI with aromatic polyethers containing pyridine units" JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, vol. 252, no. 1-2, 1 January 2003 (2003-01-01), pages 115-122, XP009103762 ISSN: 0376-7388