“…The cross-linked main chains in comb-like structure provide rigid backbone and endow gel system with high thermal stability and mechanical properties, while the free branched chains, usually oligomeric poly (ethylene glycol) chains with good segmental motion and Li + affinity, can give rise to high ionic conductivity [19]. Researchers have studied some kinds of comb-like copolymers for GPE [19][20][21][22][23][24][25][26], such as methylmethacrylate-maleic anhydride copolymer with oligo-oxyenthylene side chains [21], copolymer of acrylonitrile and poly (ethylene glycol) methyl ether methacrylate [22], poly(methyl methacrylate) grafted poly(vinylidene fluoride-hexafluoropropylene) [23]. GPE based on copolymer of butadiene-acrylonitrile rubber (NBR) and poly (ethylene glycol) methyl ether methacrylate were also studied [24], as well as the Li + interaction with ether and nitrile groups [22,27].…”