2.4.2 Microscopic observation
The impact cryo-fracture surfaces of the PLA, PLA/CSR and PLA/CSR/rubber wood composites were
observed microscopically by a Field Emission Scanning electron microscope (FE-SEM, Hitachi 4700e) at an accelerating
voltage of 2 kV. The fractured surface of each specimen was mounted on an aluminum stub and sputter coated with a thin layer of gold approximately 300 Angstrom in thickness before microscopic observation.