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Polysulfone (PSU), or Polyetherethersulfone (PEES) is a polymer thermoplastic material. It is tough, rigid, high-strength, and transparent, retaining its properties between −100 °C and +150 °C. It has very high dimensional stability; the size change when exposed to boiling water or +150 °C air or steam generally falls below 0.1%. Its glass transition temperature is 185 °C.
Chemically, polysulfone consists of repeating units of C27H22O4S. The chemical structure can be written as: H-[O-C6 H4 –C(CH3 )2 –C6 H4 –O–C6 H4 –SO2 –C6 H4 ]x -Cl.
Additional recommended knowledge
Chemical and physical properties
Polysulfone is highly resistant to mineral acids, alkali, and electrolytes, in pH ranging from 2 to 13. It is resistant to oxidizing agents, therefore it can be cleaned by bleaches. It is also resistant to surfactants and hydrocarbon oils. It is not resistant to low-polar organic solvents (eg. ketones and chlorinated hydrocarbons), and aromatic hydrocarbons.
Mechanically, polysulfone has fairly high compaction resistance, allowing its use under high pressures.
Polysulfone is resistant to compression and temperature induced deformation (boiling water). It is also stable in aqueous acids and bases and many non-polar solvents; however it is soluble in strong polar solvents such as dichloromethane and N-methylpyrrolidinone.
Polyethersulfone (PES) is a similar polymer with low protein retention.
Due to its excellent electrical properties, polysulfone is used as a dielectric in capacitors.
Polysulfone allows easy manufacturing of membranes, with reproducible properties and controllable size of pores. Such membranes can be used in applications like hemodialysis, waste water recovery, food and beverage processing, and gas separation.
Polysulfone can be used in Food and Drug Administration (FDA)-recognized devices. It is used in medical devices, food processing, feeding systems, and automotive and electronic industry.
Polysulfone has the highest service temperature of all melt-processable thermoplastics. Its resistance to high temperatures gives it a role of a flame retardant, without compromising its strength that usually results from addition of flame retardants. Its high hydrolysis stability allows its use in medical applications requiring autoclave and steam sterilization. However, it has low resistance to some solvents and undergoes weathering; however the weathering instability can be offset by adding other materials into the polymer.
Polysulfone was introduced in 1965 by Union Carbide. It is a specialty material with very small share of the total plastics market. It is very expensive both as raw material and to process, therefore it is generally not used in applications that do not call for its special properties. In such applications, it is often a superior replacement for polycarbonates.
It is supplied eg. by Solvay Advanced Polymers, BASF, HOS-Technik and PolyOne.
Polysulfone is also used as a copolymer.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Polysulfone". A list of authors is available in Wikipedia.|