Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

By Mori, Dylan I.; Martin, Rhia M.; Noble, Richard D.; Gin, Douglas L.
Published in Polymer NULL 2017

Abstract

Abstract A series of ammonium-diol and -triol ionic liquid (IL) monomers were synthesized and used in step-growth polymerization with the commercial di-isocyanate monomer, toluene-di-isocyanate (TDI), in the presence of free ammonium {IL} to form new curable ammonium-based polymerized ionic liquid/ionic liquid (PIL/IL) composite film coatings. The use of polyurethane chemistry allows for the near-complete curing of the alcohol and isocyanate monomers to yield solid, homogeneous, cross-linked polyurethane-based PIL/IL composite materials with no volatile side product formation. The physical properties and curing rates of these PIL/IL films were altered by tailoring the structures of the ammonium-alcohol {IL} monomers, the ratio of the linear vs. cross-linking {IL} monomers employed, and the amount of free {IL} in the curing reactions. Although ammonium-based {PILs} have been reported to be less thermally and electrochemically stable than their imidazolium counterparts in the literature, {TGA} results indicated a Tonset of up to 300

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