was mixed with the natural plasticizer (30 wt% in relation to PVC resin) followed by the addition of 9 mL of tetrahydrofuran. The mixture was homogenized using a magnetic stirrer for
wasmixed with the natural plasticizer (30 wt% in relation to PVCresin) followed by the addition of 9 mL of tetrahydrofuran.The mixture was homogenized using a magnetic stirrer for