A telechelic organic-inorganic polymer (SiPPSU) where -SiPh(OH)2 groups are covalently linked to the polymeric chain of polyphenylsulfone (PPSU) was prepared and characterized. The polymer was sulfonated up to a degree of sulfortation (DS) equal to 2 (SiSPPSU), then used to prepare blends with sulfonated polyetheretherketone (SPEEK) having DS = 0.9 in 5 and 10 wt.% concentration. The synthesized polymers and the blends were characterized by ATR/FT-IR spectroscopy. Membranes were prepared with these materials and their proton conductivity was measured using electrochemical impedance spectroscopy (EIS). The formation of the blends substantially altered the physicochemical characteristics of SPEEK: the membrane prepared with the blend at the concentration of 5 wt.% exhibited high and stable conductivity values at 120 degrees C: both when dry (sigma = 6.1 x 10(-3) S/cm) and wet conditions (sigma = 6.4 X 10(-2) S/cm for a 50% water uptake), hence, being suitable for application as electrolyte in intermediate temperature polymer electrolyte membrane fuel cells (PEMFCs). (c) 2005 Elsevier B.V. All rights reserved.
SPEEK/PPSU-based organic-inorganic membranes: proton conducting electrolytes in anhydrous and wet environments RID E-4547-2011
Trombetta M;
2006-01-01
Abstract
A telechelic organic-inorganic polymer (SiPPSU) where -SiPh(OH)2 groups are covalently linked to the polymeric chain of polyphenylsulfone (PPSU) was prepared and characterized. The polymer was sulfonated up to a degree of sulfortation (DS) equal to 2 (SiSPPSU), then used to prepare blends with sulfonated polyetheretherketone (SPEEK) having DS = 0.9 in 5 and 10 wt.% concentration. The synthesized polymers and the blends were characterized by ATR/FT-IR spectroscopy. Membranes were prepared with these materials and their proton conductivity was measured using electrochemical impedance spectroscopy (EIS). The formation of the blends substantially altered the physicochemical characteristics of SPEEK: the membrane prepared with the blend at the concentration of 5 wt.% exhibited high and stable conductivity values at 120 degrees C: both when dry (sigma = 6.1 x 10(-3) S/cm) and wet conditions (sigma = 6.4 X 10(-2) S/cm for a 50% water uptake), hence, being suitable for application as electrolyte in intermediate temperature polymer electrolyte membrane fuel cells (PEMFCs). (c) 2005 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.