Synthesis and Characterization of Ionic Polyurethanes Based On Pyrrolidinium Ionic Liquid Monomers
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초록
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A series of ionic polyurethanes containing pyrrolidinium cations on the polymer backbone is synthesized from dihydroxy alkylene pyrrolidinium ionic liquid monomers, and polyethylene glycol (PEG), and 4,4’-diphenylmethane diisocyanate (MDI). 1H NMR and FT-IR analyses are used to see the reaction completion and mole ratio between the ionic and non-ionic ratio in the synthesized polyurethanes. The ionic polyurethanes containing PEG units show higher thermal stabilities than those of the polyurethane with no PEG. The polyurethane with PEG-4000 and PF6- anions shows highest thermal stability, up to 350 ℃. The polyurethanes with PEG-4000 may have crystalline phases below their melting temperatures, however the other polyurethanes are amorphous. The copolymers of PEG-4000 show higher conductivities; the polyurethane with PEG-4000 and PF6- anions shows 1.84×10-4 S/cm at 50 ℃.