Synthesis of triazine-based solid polymer electrolyte bearing oligo (ethylene oxide) chain

Homopolymers (Poly3EO3 and Poly4EO3) and copolymers (Poly4EO3Sn and Poly4EO3Mn, It indicating the content of styrene and methyl acrylate in mol% composed of isopropenyltriazine bearing three or four oligo (ethylene oxide) chains (3EO3 or 4EO3) were prepared by radical polymerization. These polymers exhibited glass transition temperatures T-g lower than -70 degrees C. The polymer electrolyte obtained by doping Poly4EO3 with LiClO4 maintained a low T-g (-52 degrees C), which suggests that two oligo (ethylene oxide) chains in the same 4EO3 unit coordinate to the lithium ion. The ICP analysis showed that the 4EO3 unit holds two lithium ions. On the other hand, the polymer electrolyte obtained by blending Poly3EO3 with LiClO4 showed a higher T-g (38 degrees C). The lithium ion conductivity was measured with each polymer doped with low concentration of various lithium salts. When doped with lithium trifluoromethanesulfonimide (LiTFSI), Poly4EO3M15, composed of 85 molyo 4EO3 and 15 mol% methyl acrylate showed a relatively high ionic conductivity (1.15 x 10(-4) S/cm).