Research interest in charged polymers that are based upon, derived from and/or able to strongly interact with ionic liquids (ILs) has significantly accelerated in recent years. The majority of these charged polymers take the form of polyelectrolytes, wherein the cation and/or anion is a pendant from the polymer backbone. Ionenes are an analogous class of ionic polymers wherein the charged moeities reside directly within the polymer backbone rather than as pendants. Typically, the "free" couteranion associated with ionenes is a halide or an inert molecular species such as trfilate(OTf<sup>-</sup>).  While the overwhelming majority of ionenes in the scientific and patent literature have cationic backbones, a limited number of anionic ionenes are also known. Anionic ionenes are highly attractive as they are likely to be more thermally stable and the "free" cation counterion can either be an inert or reactive/catalytic species. However, anionic ionenes are more synthetically challenging and the requisite species from they can be formed is somehwat more limited than those available for cationic ionenes. This presentation will detail our approaches to the synthesis of a variety of new types of anionic ionenes, their physical properties, and application as gas separation membranes.

Anionic ionenes: Synthesis of "main-chain" polyanions for diverse applications

2019 Fall National Meeting

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