Mechanical Properties at Room and Elevated Temperatures According to the Thickness Ratio of Coextruded Film Using Polycarbonate and Acrylic Resin

In this study, the mechanical properties of polycarbonate (PC)/polymethyl methacrylate (PMMA) multilayer films according to temperature were studied. The mechanical properties examined are modulus of elasticity, yield strength, tensile strength, elongation at break and Poisson's ratio. In a multilayer film with a thickness of 250 µm, the mechanical properties were observed with different thickness ratios. In addition, the mechanical properties in the flow direction and the direction perpendicular to the flow of the co-extrusion process were compared. Properties below the glass transition temperature (T_g) showed high mechanical properties due to molecular orientation in the extrusion direction. In the PC/PMMA multilayer film, a large change in mechanical properties was shown at the T_g of the thick layer material. The higher the temperature, the higher the Poisson's ratio of the film, but the difference according to the extrusion direction became smaller.