Polyphosphazene electrolytes. 2. Synthesis and properties of new polymer electrolytes based on poly((amino)[(2-methoxyethoxy)ethoxy])phosphazenes

A series of ether group and amino group cosubstitutent phosphazene copolyme rs was synthesized and characterized by a combination of NMR, elemental ana lysis, and FTIR spectroscopy. The length of the alkyl group in the amino si de chain and the content of the methoxyethoxyethoxy (MEE) substituent on th e polymer properties were varied. Dynamic mechanical analysis (DMA) demonst rated that the cosubstitutent polymers prepared have better mechanical prop erties than the ether homopolyphosphazene, poly[bis(2-methoxyethoxy)ethoxy] phosphazene MEEP. The copolymers that possessed multiple electron-donor coo rdination sites, nitrogen and oxygen atoms, were complexed with various amo unts of lithium perchlorate (LiClO4) to form polymer electrolytes. The ioni c conductivity of the polymer electrolytes were determined by an impedance analyzer in a temperature range of 30-80 degrees C. According to those resu lts, the conductivities of the prepared polymer electrolytes increased acco rding to the rise in the MEE side chain contents and reached optima at F = 0.2-0.25. The best conductivity obtained is 2.2 x 10(-5) S/cm for CPE-3A wi th F = 0.25.