Mechanical properties Plexiglass has good comprehensive […]
Plexiglass has good comprehensive mechanical properties, and it is in the forefront of general-purpose plastics. The tensile, bending and compressing strengths are higher than that of polyolefins, but also higher than that of polystyrene and polyvinyl chloride. The impact toughness is poor, but it is also slightly better. In PS. The cast bulk polymethyl methacrylate sheet (such as aerospace plexiglass sheet) has higher mechanical properties such as stretching, bending and compression, and can reach the level of engineering plastics such as polyamide and polycarbonate.
In general, PMMA has a tensile strength of 50-77 MPa and a flexural strength of 90-130 MPa. The upper limit of these performance data has reached or exceeded that of some engineering plastics. Its elongation at break is only 2%-3%, so the mechanical properties are basically hard and brittle plastics, and it has notch sensitivity. It is easy to crack under stress, but the fracture is not as sharp as PS and ordinary inorganic glass. Ragged. 40 ° C is a secondary transition temperature, which is equivalent to the temperature at which the side methyl group starts to move. When the temperature exceeds 40 ° C, the toughness and ductility of the material are improved.