What are polycarbonates (PC)?

Polycarbonates are characterized by their transparency (translucency). This is achieved by the amorphous character of the thermoplastic, with a density of 1.20 g/cm³. The most commonly used polycarbonate is obtained from bisphenol A and phosgene via polycondensation. This esterifies bisphenol A via a carboxylic acid. However, polycarbonates can also be produced with other monomers and via other synthesis routes such as transesterification or ring-opening polymerization. The application temperature range is – 80 to +130 °C. PC has good rigidity and impact strength and polycarbonates are self-extinguishing. They are resistant to saturated hydrocarbons, diluted mineral acids and alcohols with the exception of methanol. They are not resistant to UV radiation, strong alkalis, aromatic hydrocarbons and halogenated hydrocarbons. There is also a high risk of stress cracking due to the amorphous nature of polycarbonates. Polycarbonates are also available glass fiber reinforced (PC GF), which improves some mechanical properties. Polycarbonates are used in electrical engineering, in optics, e.g. for optical lenses, and in household appliances such as CDs and DVDs.