Properties and Alkaline Stability of Composite Anion Conducting Ionomers Based on Poly(phenylene oxide) Grafted with DABCO and Mg/Al Lamellar Double Hydroxide

L. Pasquini (1) , R.-A Becerra-Arciniegas (1) , R. Narducci (2) , E. Sgreccia (2) , Vincent Gressel (2) , Philippe Knauth (1)

1 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie
2 Università degli Studi di Roma Tor Vergata [Roma]

We studied composite anion exchange membranes made from poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with grafted 1,4diazabicyclo[2.2.2]octane (DABCO) and Mg/Al lamellar double hydroxide particles as inorganic filler. The mechanical and conductivity properties were measured in fully humidified conditions. The activation energy for conductivity amounts to (0.20 � 0.01) eV. The degradation of the anion-exchange membrane in 2MNaOH at 60°Cw as investigated during 168 h following the ionic conductivity, water uptake, and ionexchange capacity as function of the alkaline treatment time. The degradation is rapid within the first hours and then slows down. The degradation was also studied by thermogravimetric analysis and FTIR spectroscopy, showing the various decomposition phenomena of the composite.

Keywords: degradation; ion exchange capacity; ionic conductivity; membranes; nanoparticles

Domains: Chemical Sciences

L. Pasquini, R.-A Becerra-Arciniegas, R. Narducci, E. Sgreccia, Vincent Gressel, et al.. Properties and Alkaline Stability of Composite Anion Conducting Ionomers Based on Poly(phenylene oxide) Grafted with DABCO and Mg/Al Lamellar Double Hydroxide. ChemElectroChem, 2020, 7 (13), pp.2917-2924. ⟨10.1002/celc.202000523⟩. ⟨hal-03162027⟩