Abstract
Herein, we synthesized a series of siloxane-based poly(ionic liquid)s (PILs) with imidazolium-type species in the main chain via the multicomponent Debus–Radziszewski reaction. We employed oligodimethylsiloxane diamine precursors to integrate flexible spacers in the polymer backbone and ultimately succeeded in obtaining main-chain PILs with low glass transition temperatures (Tgs) in the range of −40 to −18 °C. Such PILs were combined with conventional hydrophobic vinylimidazolium-based PILs for the fabrication of porous membranes via interpolyelectrolyte complexation with poly(acrylic acid), which leads to enhanced mechanical performance in the tensile testing measurements. This study will enrich the structure library of main-chain PILs and open up more opportunities for potential industrial applications of porous imidazolium-based membranes.
Highlights
Poly(ionic liquid)s (PILs) have recently served as a substantial class of functional polymers that carry ionic liquid (IL)-like species in the repeating unit
Among the various classes of PILs, imidazolium-type ion pairs have been studied the most due to their easy accessibility and favorable properties when employed in PILs, such as high polarity as well as chemical and thermal stability.[18−20] Mainchain PILs are commonly synthesized from mono/bissubstituted imidazole precursors.[6,21,22]
For the first time, oligosiloxane-based diamines as precursor were utilized in a Debus−Radziszewski reaction to yield siloxane-based imidazolium-type PILs, expanding the scope of this industrially relevant multicomponent reaction
Summary
Poly(ionic liquid)s (PILs) have recently served as a substantial class of functional polymers that carry ionic liquid (IL)-like species in the repeating unit. Membranes suffered from low mechanical performance that has limited their industrial use In this contribution, we set out to expand the scope of the Debus−Radziszewski reaction toward siloxane-based mainchain PILs. By using oligodimethylsiloxane diamine precursors under aqueous and mild conditions, we prepared 1,3disubstituted imidazolium-type PILs with unusually low Tgs. we studied two essential reaction parameters and their influence on the structure and properties of the resultant PILs. we fabricated composite porous membranes from a mixture of such “liquid-like” main-chain PIL with a common hydrophobic vinylimidazolium-type PIL and PAA. The flexibility of the siloxane spacers explicitly improved the mechanical properties of these porous membranes
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