2. Experimental methods
2.1 Materials
Low density polyethylene (LDPE, Grade C150Y PETLIN) with MFI of 5.20 g/10 min was purchased from Global Connections PCL. Thailand. Ethylene vinyl acetate (EVA) with MFI of 2.9 g/10 min (190 oC, 2.16 kg.) was obtained from TPI Polene PCL. Thailand. Three essential oils (EOs) namely clove leaf oil (Syzygium aromaticum), sweet basil oil (Ocimum Basillium) and cinnamon bark oil (Cinnamomum Zeylamicum) whose important constituents and chemical structures are listed in table 1 and supplied by Chemipan Co., Ltd., Thailand.