Synthesis of porous polymers by means of Michael addition reaction of multifunctional acetoacetate and poly(ethylene glycol) diacrylate

•Porous polymers were successively synthesized by the Michael addition reactions of multifunctional acetoacetate and poly(ethylene glycol) diacrylate (PEGDA) compounds in mixed solvents of ethanol/dimethyl sulfoxide using a base catalyst at room temperature.•The porous polymers were formed by the connected spheres, and the monomer concentration, molecular weight of PEGDA, and structure of multifunctional acetoacetate affected size of the spheres.•The porous polymers were soft and flexible, and were no breakable by compression, absorbed various solvents.•The porous polymers, which absorbed propylene carbonate solution of a lithium salt, showed high ionic conductivity.