Poly (ether sulphone) also called PES is an amorphous thermoplastic that has properties comparable to polycarbonates. However, polyether sulphones are more heat resistant and have other properties that make them suitable for a variety of high temperature applications especially those requiring service in excess of 200 oC.
The polyether sulphones were first made by the Union Carbide Corporation, a subsidiary of Dow Chemicals, in 1965. The material made was registered under the name “Udel®”. Nowadays, various iterations have been made such as Veradel®, Acudel® and Radel®. They were introduced exclusively for high temperature-high strength applications and on account of their expensive…show more content… PES can be strengthened with glass fibers and carbon fibers to enhance specific properties as required. For instance, 40 % glass fibre addition gives the PES a much higher flexural modulus.
Poly (ether sulphone) can be synthesized by a condensation reaction. The reaction generally occurs between phenylsulphones and a bisulphone salt. However, depending on what sort of repeating unit and thermal and mechanical properties we want, we can play with the number of ether linkages added to the main chain. The two Poly (ether sulphone) are shown below:
The primary method involves the reaction between a di-n-fluorophenylsulphone with sodium salt of bisphenol A. The sulphone is dissolved in a solvent such as dimethylsulphoxide at temperatures of 130 – 160 oC. The salt NaF is eliminated. The reaction scheme is: ICI PES 200P
As shown in the above molecule, the PES produced has 2 ether linkages which give it high flexibility. The ICI made the Poly (ether sulphone) with one ether linkage which resultingly had higher glass transition of 230 oC compared to standard Poly (ether sulphone)’s 220 oC. It is also less flexible. Its structure is: