Scanning electron microscopy (SEM) can provide a better understanding of the relationships of water vapor transmission, mechanical, and optical properties with the films’ structural char-acteristics. Fig 3 shows the SEM micrographs of the outer surface (left) and cross section (right) for both the control and glycerolcontaining films. SEM micrograph of plasticized films showed smooth and uniform surface morphology without pores or cracks compared with those films without glycerol. SEM observations of BSG films with different glycerol concentrations did not present any notable differences in structure. These results were similar to those achieved by Jouki, Khazaei et al. (2013), whose CSG films tended to become more smooth and uniform surface with an increase in plasticizer content