SEM micrographs of all samples are shown in Fig. 1. Fig. 1 aedemonstrates that no marked differences were detected among the cross sectional micro structures of PLA films plasticized with 0–10% NOL. The PLA films plasticized with 10% NOL still showed a uni-form phase, indicating that NOL was evenly distributed in the PLA matrix. The results are in good agreement with the theoretical prediction of the compatibility.