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Journal Article

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Jesse D. Jones College of Science, Engineering and Technology


Perarylated phosphonium salts are known to exhibit high degrees of thermal stability, often in excess of 400 °C. Here, the thermal and conductive properties of a series of perarylated phosphonium ionenes, prepared utilizing a PAEK-/PES-like synthetic approach, is described. All of the ionenes were found to display Td5% values in excess of 365 °C. Structural changes in the polymer backbone were found to have a prominent impact on Tg, with the meta-analogs exhibiting values ∼45 °C below the para-analogs, emphasizing the significant impact that solid-state packing can have on thermal transitions. All of the phosphonium ionenes were found to be resistant to decomposition under caustic conditions (NaOH), even at elevated temperature (60 °C) over a period of 48 h. Ionic conductivities were on the order of ∼10−7 S/cm at 120 °C, with the meta-analogs exhibiting a 1-2 orders-of-magnitude enhancement compared to their para-analogs, indicating that disruption of chain packing can lead to improvements in ionic conductivity while maintaining relatively high thermal and chemical resistance.


This is an Accepted Manuscript of a peer-reviewed article published by Elsevier in Polymer, available at

Available for download on Tuesday, July 22, 2025

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