ABSTRACT
Polyethersulfone (PES) belongs to the polysulfone group of thermoplastics. The chemical structure of polyethersulfone consists of aromatic sulfone units linked through an ether bridge. The properties of polyethersulfone that distinguish it from most other thermoplastics are its high temperature performance, good mechanical strength, and low flammability. Impact strength can be affected by a number of factors, including temperature, moisture, specimen geometry, and processing conditions. Thermoplastics show only a relatively small change of properties with temperature until the glass transition temperature is reached, whereupon a dramatic change occurs. PES has the highest glass-transition temperature of any common thermoplastic; consequently, its properties show a relatively small dependence on temperature up to 200 C. The high-temperature performance of PES together with its dimensional stability and fire resistance make it well suited to the electronics and electrical industry. Impact strength can be affected by a number of factors, including temperature, moisture, specimen geometry, and processing conditions.
