fig2

Figure 2. Comparison of DC conductivities corresponding to Li (blue symbols) and Na (red symbols) homopolymers (dots), copolymers without salt (open circles), and copolymers with salt (crosses); see text for details. The vertical dashed line corresponds to room temperature. The black lines represent VFT fits of the data for copolymers; see text for details. DC: Direct-current; VFT: vogel-fulcher-tammann.