Communication Dans Un Congrès Année : 2019

Proton transport within acid aggregates in a hydrated precise sulfophenylated polyethylene

Résumé

Hydrated acid aggregates in a precise sulfophenylated polyethylene exhibit high proton conductivity. This study focuses on a new precise polymer synthesized by ring-opening polymerization, p5PhSA, that has a polyethylene backbone with a sulfonated phenyl group pendant on every 5 th carbon. The structure of p5PhSA is characterized with X-ray scattering and the proton conductivity is measured by electrical impedance spectroscopy. Experiments are performed as a function of relative humidity and temperature. Water uptake in p5PhSA is determined by sorption measurements as a function of humidity. Atomistic molecular dynamics simulations are used to elucidate the structure of the acid aggregates in the amorphous polymer matrix and are directly compared to absolute X-ray scattering data. At 40°C and 90% relative humidity, the proton conductivity of p5PhSA is 0.23 S/cm, exceeding that of Nafion at the same conditions. At room temperature, the interaggregate distance nearly doubles from 1.8 nm at 0% relative humidity to 3.4 nm at 100% relative humidity. The swelling of these acid aggregates with water is reversible and facilitates the proton transport through p5PhSA. Figure 1

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Dates et versions

hal-02400835 , version 1 (09-12-2019)

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Citer

Benjamin Paren, Lionel Picard, Patrice Rannou, Manuel Maréchal, William Neary, et al.. Proton transport within acid aggregates in a hydrated precise sulfophenylated polyethylene. 235th ECS Meeting, May 2019, Dallas, United States. pp.1571-1571, ⟨10.1149/MA2019-01/30/1571⟩. ⟨hal-02400835⟩
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