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Decoupled Cation Transport within Layered Assemblies in Sulfonated and Crystalline Telechelic Polyethylenes

Decoupled Cation Transport within Layered Assemblies in Sulfonated and Crystalline Telechelic Polyethylenes

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PAREN, Benjamin A., Manuel HÄUSSLER, Patrick RATHENOW, Stefan MECKING, Karen I. WINEY, 2022. Decoupled Cation Transport within Layered Assemblies in Sulfonated and Crystalline Telechelic Polyethylenes. In: Macromolecules. American Chemical Society (ACS). 55(7), pp. 2813-2820. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/acs.macromol.2c00132

@article{Paren2022-03-14Decou-57360, title={Decoupled Cation Transport within Layered Assemblies in Sulfonated and Crystalline Telechelic Polyethylenes}, year={2022}, doi={10.1021/acs.macromol.2c00132}, number={7}, volume={55}, issn={0024-9297}, journal={Macromolecules}, pages={2813--2820}, author={Paren, Benjamin A. and Häußler, Manuel and Rathenow, Patrick and Mecking, Stefan and Winey, Karen I.} }

Mecking, Stefan 2022-04-29T06:05:58Z Paren, Benjamin A. Winey, Karen I. Winey, Karen I. eng 2022-04-29T06:05:58Z Rathenow, Patrick Rathenow, Patrick We present a set of sulfonated monodisperse telechelic polyethylene ionomers that demonstrate ion transport of metal cations in layered ionic assemblies. These semicrystalline ionomers have precisely 48 backbone carbons with a sulfonated group at each end and are fully neutralized by a counterion, C<sub>48</sub>(SO<sub>3</sub>X)<sub>2 </sub>(X = Li<sup>+</sup> or Na<sup>+</sup>). The morphology of these polymers is characterized by using X-ray scattering, and ionic conductivity is probed by using electrochemical impedance spectroscopy. These telechelic polyethylenes exhibit well-defined ionic layers at all temperatures below the melting point, and the crystal packing of the backbone varies with temperature. The polyethylene backbone packs in hexagonal crystals at high temperatures in both C<sub>48</sub>(SO<sub>3</sub>Li)<sub>2</sub> and C<sub>48</sub>(SO<sub>3</sub>Na)<sub>2</sub>, with Arrhenius activation energies (E<sub>a</sub>) for ion transport of 120 and 53 kJ mol<sup>–1</sup>, respectively, indicating that decoupled ion transport is possible through these layered ionic assemblies. The E<sub>a</sub> in this hexagonal regime is significantly lower than E<sub>a</sub> at room temperature where C<sub>48</sub>(SO<sub>3</sub>Li)<sub>2</sub> exhibits disordered crystals and C<sub>48</sub>(SO<sub>3</sub>Na)<sub>2</sub> exhibits orthorhombic crystallites, highlighting the impact of polymer packing between the ionic layers. At intermediate temperatures (120–160 °C) the hexagonal crystal structure in C<sub>48</sub>(SO<sub>3</sub>Na)<sub>2</sub> coexists with an unidentified crystal phase that appears to have superior ion transport properties. When compared to other single ion conductors of the same functionality, C<sub>48</sub>(SO<sub>3</sub>Na)<sub>2</sub> also demonstrates the importance of ionic assembly shape and identifies ionic layers as a promising strategy relative to assemblies with less order. Decoupled Cation Transport within Layered Assemblies in Sulfonated and Crystalline Telechelic Polyethylenes 2022-03-14 Mecking, Stefan Häußler, Manuel Häußler, Manuel Paren, Benjamin A. Attribution-NonCommercial-NoDerivatives 4.0 International

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