Synthesis and thermal properties of polystyrene-graft-PEG copolymers as new kinds of solid-solid phase change materials for thermal energy storage

► A series of polystyrene-graft-PEG6000 copolymers as new kinds of polymeric solid-solid phase change materials (SSPCMs) were synthesized. ► The synthesized SSPCMs had typical solid-solid phase transition temperatures. ► The results showed that the SSPCMs could be used as thermal energy storage materials.