Ionic conductivities of poly(methoxy polyethylene glycol monomethacrylate) complexes with LiSO3CH3

Ionic conductivity values for LiSO₃CF₃ complexes with two amorphous poly(methoxy polyethylene glycol monomethacrylates) (PEM) were determined and values as high as $\text{～6 × 10}{}^{\mathrm{?4}}\text{Ω}{}^{\mathrm{?1}}\text{cm}{}^{\mathrm{?1}}$ at 373 K and $\text{～2 × 10}{}^{\mathrm{?5}}\text{Ω}{}^{\mathrm{?1}}\text{cm}{}^{\mathrm{?1}}$ at 293 K were achieved. These values are compared with those obtained for a poly(ethylene oxide) (PEO)-LiSO₃CF₃ complex of similar salt concentration with an ether oxygen to Li⁺ ion ratio of 18. The conductivity results for the complexes are similar at temperatures >343 K but at 293 K the values for the conductivities of the PEM-LiSO₃CF₃ complexes are approximately two orders of magnitude higher than those for the PEO-LiSO₃CF₃ complex. This difference is believed to be due at least in part to the presence of a large amount of crystalline material in the PEO-LiSO₃CF₃ complex below 323 K.