polyarylates

Polyarylates are a class of high-performance aromatic polyesters. They are characterized by the presence of phenyl rings directly attached to the ester linkages in their polymer backbone. This aromatic structure imparts significant thermal stability, mechanical strength, and good electrical insulation properties to polyarylates. They typically exhibit high glass transition temperatures (Tg) and good dimensional stability at elevated temperatures.

The synthesis of polyarylates usually involves the polycondensation reaction between bisphenols and aromatic dicarboxylic acid chlorides or diacids. A common method is the interfacial polycondensation of bisphenol A with terephthaloyl chloride and isophthaloyl chloride. By varying the ratio of these monomers, the properties of the resulting polyarylate can be tailored, influencing factors like Tg, crystallinity, and solubility.

Polyarylates possess a combination of desirable properties, including excellent heat resistance, good hydrolytic stability, inherent flame retardancy, and resistance to UV radiation. They are also known for their high impact strength, particularly at low temperatures, and good electrical properties, making them suitable for various demanding applications.

These materials find use in a range of industries. Their high thermal performance and mechanical strength make them suitable for electrical connectors, automotive components, appliance parts, and aerospace applications. They are also employed in optical lenses and films due to their transparency and UV resistance. The ability to process polyarylates via conventional melt processing techniques, such as injection molding and extrusion, further contributes to their versatility.