Homopolymerizations of Pyrrolidinium and Piperidinium Ionic Liquid Monomers by Cu(0)-Mediated SET-LRP
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Polymerized ionic liquids (PILs) were prepared by Cu(0)-mediated single electron transfer living radical polymerization (SET-LRP). The polymerization reaction completion was confirmed by 1H NMR analysis. Most of the PILs containing pyrrolidinium and piperidinium appear a gel state at room temperature. Only an ionic polymer of pyrroldinium-PF6 salt shows a solid phase at room temperature. For the polymers with different anions, Tf2N- polymers have better thermal stabilities than the PF6- ones. Within the temperature range of differential scanning calorimetry analysis, all the synthesised PILs have an amorphous morphology. The PILs containing Tf2N- anion have lower glass transition temperature than PF6- ones, The effect of degree of polymerization to the glass transition temperature was to be confirmed, however the the molecular weights of the PILs are not eaily confirmed; only PILs show end group peaks in 1H NMR spectra and molecular weight determination is very limited for these PILs.