Polyvinyl chloride (PVC) with K-value of 580 was kindly supplied by Thai Plastic and Chemicals Co., Ltd. The solvent N, N-dimethylformamide (DMF) and tetrahydrofuran (THF) were used as received. PVC was dissolved in a mixed solvent of DMF/THF (at weight ratio 5:5) by varying the PVC concentration for 10% and 15% by weight at 50oC. ENR was dissolved in the same solvent mixtures as PVC solution. The ENR solution was directly mixed with PVC solution at room temperature. The nanofibrous membranes were prepared by eS-robot electrospinning capable of generating voltages up to 30 kV at room temperature. Electrospinning was performed at a flow rate 0.5 mL/h with applied voltage between 12 and 15 kV. The distance between the syringe tip and collector plate was varied from 12 to 18 cm. The nanofibrous was then deposited on the collector plate and formed thin film with thickness around 0.1 mm.