Scanning electron microscopy (SEM) of film samples was
obtained using a Philips XL-30 scanning electron microscope. The
samples were coated with a fine gold layer before obtaining the
micrographs. All samples were examined using an accelerating
voltage of 10 kV. Micrographs of drying exposed surface and fracture
(cryofracture) of films plasticized with 0.3 g of plasticizer/g of
raw material were carried out.