Journal
POLYMER CHEMISTRY
Volume 2, Issue 11, Pages 2609-2618Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1py00282a
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Funding
- Russian Foundation for Basic Researches [10-03-00391-a]
- Swiss National Science Foundation [IZ73Z0_128071/1]
- University of Cergy-Pontoise
- Swiss National Science Foundation (SNF) [IZ73Z0_128071] Funding Source: Swiss National Science Foundation (SNF)
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Three novel ionic monomers having highly delocalized anions and electrochemically stable mobile cations, namely, 1-butyl-1-methylpyrrolidinium 1-[3-(methacryloyloxy) propylsulfonyl]-1-(trifluoromethane-sulfonyl) imide, 1-butyl-1-methylpyrrolidinium 1,1-dicyano-1-[(3-(methacryloyloxy) propylsulfonyl)] methanide and 1-butyl-1-methylpyrrolidinium 1-cyano-1-[(3-(methacryloyloxy) propylsulfonyl)] imide were synthesized and characterized. The structure of these monomers was designed to be a mimic of the most highly conductive bis(trifluoromethylsulfonyl) imide, tricyanomethanide and dicyanamide anions. By radical polymerization procedure a series of new anionic polymeric ionic liquids (PILs) were prepared. The solubility of these linear PILs, thermal stability, glass transition temperatures, molar masses and ionic conductivities were estimated. An advantage of the novel PILs was demonstrated by the comparison of their ionic conductivity at 25 degrees C (2.0 x 10(-8) divided by 1.6 x 10(-7) S cm(-1)) with the unmodified poly(1-ethyl-1-methylpyrrolidinium 3-(methacryloyloxy)propane-1-sulfonate) analog. The increase in ionic conductivity is as high as three orders of magnitude and was found to depend on the size of the attached anion. The new ionic monomers were subsequently copolymerized with poly(ethylene glycol) dimethacrylate and poly (ethylene glycol) methyl ether methacrylate. The investigation of the copolymers properties revealed further improvement of the conductivity in approximately two orders of magnitude and the achievement of sigma = 4.8 divided by 6.8 x 10(-6) S cm(-1)) at 40 degrees C.
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