Аннотация:Block copolymers with AB-block, consisting of a random copolymer of an anionic monomer bearing Li+ and poly(ethylene glycol) methyl ether methacrylate, and C-block based on poly(2-indanyl methacrylate), were synthesized via RAFT-polymerization technique. The variation in molecular weights (62÷71 kDa) and mass ratio between ionic and neutral blocks (MI/MN=1.92÷2.18) allowed to obtain copolymers with combination of ionic conductivity up to 6×10-7 S/cm (25°C) and enhanced mechanical (viscoelastic) properties. Such combination was gained due to microphase separation caused by the incompatibility of AB and C blocks. The AFM study indicated the formation of lamellar structures.