2.4. Morphological study
Studies on the morphology of the composites were carried out using a scanning electron microscope (SEM).SEM micrographs of the fracture surfaces of the specimens after tensile test were taken using a SEM model WEGA-II TESCAN. The specimen was coated with a thin film (100 A) of gold to avoid electrical charge accumulation during the examination and then analyzed at an accelerating voltage of 25–30 kV [24]. The surface morphology of the films that had been
previously conditioned at 50% RHwas also studied using an atomic force microscope (AFM, Q-Scope 250, Quesant,
USA). Samples were cut into thin pieces and stuck onto the sample stage. A contact cantilever with broadband scan
mode was used to record the micrographs. The resulting data for each samplewas transformed into a 3D image [25].
To make the results comparable, the images were obtained from the center area of each surface.