Polyethersulfone PES Resin

The end groups in a PES polymer chain are chlorine atoms. Other forms of PES are sold which may contain the bisphenol-A moiety, which can compromise thermal stability and chemical resistance. 

The polymer can be used to control resin flow when processing epoxy based prepreg and can also be incorporated in resin matrices as a toughener. 

The failure mechanisms of carbon fiber reinforced PES have been investigated [154]. Although toughness of the PES composite was lower than comparable results with PEEK, results were independent of the test temperature (—60-100°C), whereas the PEEK composite showed a change to unstable fracture at low temperatures. 

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