Tailoring surface properties of polyethylene terephthalate by atmospheric pressure plasma jet for grafting biomaterials

•Surface hydrophilicity of polyethylene terephthalate (PET) is controllable.•Dependence of RF power on the chemical properties of plasma-treated PET.•Thermosensitive polymers grafted on plasma-treated PET were investigated.•Immobilization of aspirin on plasma-treated PET for drug release was achieved.