High ionic conductivity in PEO. PPO block polymer + salt solutions

摘要: Abstract The conductivity of LiI dissolved in a block copolymer polypropylene and polyethylene oxide sections comparable length has been measured found greater than for either the pure polymer solutions. composition maximum occurs at low concentration as predicted from entropy theories which salt mainly serves to raise glass transition temperature. A VTF equation gives good description temperature dependence high concentrations. At concentrations, however, complications due redistribution between distinct microregions microscopically segregated units, causes complex dependence. intermediate compositions two transitions are observed. These blend into single