= Polyethersulfone
\b[Polyethersulfone], commonly abbreviated PESU, is an aromatic <polymer> with ether and <sulfone> linkages in its <polymer backbone>. It belongs to the sulfone-containing engineering <thermoplastics>. The complete <repeat unit>, rather than the presence of one sulfur-containing group, distinguishes its chemical identity from related <polysulfone> and <polyphenylsulfone> materials.<Ultrason E, S, P product information by BASF>[Product range: PESU, PSU and PPSU families; corresponding family descriptions in brochure printed p.10.]{ref}
BASF identifies its PESU family as an amorphous <thermoplastic>. These terms answer different questions: amorphous concerns the absence of long-range crystalline order, while thermoplastic concerns the material's ability to soften for reshaping. A <glass transition> is therefore a change in physical response, rather than necessarily a chemical cleavage of the <polymer backbone>.<Ultrason E, S, P product information by BASF>[Product range: amorphous thermoplastic classification.]{ref}
For an illuminating comparison, imagine testing the same polymer chemistry with two different chain-length distributions. The local ether and sulfone connections can remain the same while flow behavior and mechanical response differ. A useful measurement report must identify both the chemical family and the sample being tested; naming PESU alone does not specify every processing or mechanical property.
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