Highly phosphonated polypentafluorostyrene: characterization and blends with polybenzimidazole
Date
2013Author
Atanasov, Vladimir
Kerres, Jochen
Gudat, Dietrich
Ruffmann, Bastian
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In this study we present results of the conductivity and resistance to thermooxidative and
condensation reactions of a highly phosphonated poly(pentafluorostyrene) (PWN2010)
and of its blends with poly(benzimidazole)s (PBI). This polymer, which combines both:
(i) a high degree of phosphonation (above 90%) and (ii) a relatively high acidity (pKa (–PO3-
H2M–PO3H ) 0.5) due to the fluorine neighbors, is designed for low humidity operating
fuel cell. This was confirmed by the conductivity measurements for PWN2010 reaching
r = 5 10 4 S cm 1 at 150 C in dry N2 and r = 1 10 3 S cm 1 at 150 C (k = 0.75). Furthermore,
this polymer showed only 48% of anhydride formation when annealing it at
T = 250 C for 5 h and only 2% weight loss during a 96 h Fenton test. These properties combined
with the ability of the PWN2010 to form homogeneous blends with polybenzimidazoles
resulting in stable and flexible polymer films, makes PWN2010 a very promising
candidate as a polymer electrolyte for intermediate- and high-temperature fuel cell
applications.
URI
http://hdl.handle.net/10394/13846https://www.sciencedirect.com/science/article/pii/S0014305713004473
https://doi.org/10.1016/j.eurpolymj.2013.09.002