A novel and simple procedure to synthesize chitosan-graft-polycaprolactone in an ionic liquid

► The chitosan-graft-polycaprolactone was synthesized through a convenient, green and efficient method. ► The grafting content of polycaprolactone (PCL) of the copolymer could reach as high as 630%. ► The obtained graft copolymers are expected to have the advantageous properties of two polymers.