Polysulphones are amorphous engineering thermoplastics containing the sulfone groups (SO2) in the main chain along with a variety of aromatic constituents like ether or iso-propylidene groups.
There are four major members of the polysulfone family. These are:
1) Polysulfone
2) Polyarylsulfone
3) Polyethersulfone
4) Polyphenylsulfone

Properties:
Polysulphones are engineering plastics with high strength, stiffness combined with toughness.
They display high thermal and oxidative stability, low creep and transparency - The presence of aromatic elements and sulfone group provide resistance to heat and oxidation.
They display good dimensional stability, retain strength and dielectric properties during their service life.
Polysulfones have low flammability.
Very few polymers can match this high temperature performance - Polysulfone can be used upto 150 degree C, whereas Polyethersulfone can be used upto 200 degree C.
Resistance to hydrolysis at high temperature and to most acids, alkalies and non polar organic solvents is excellent, but the resin may however be attacked or dissolved by polar solvesnts, especially under stress.
Resistance to ionization radiation is high, however protection to UV radiation is needed for outdoor applications.

Applications:
Polysulfones find application in electronic and automotive parts, fiber optics, medical instruments requiring sterilization, chemical and food processing equipment, plumbing and home appliance items etc.
Copolymers of Polysulfones have potential in medical application to be used as an artificial membrane to remove CO2 and perfuse with O2. Membranes are semi-permeable barriers that allow certain substances such as water to pass through, while other substances like bacteria and viruses are selectively separated and not allowed to pass through. Other applications of Polysulfone membranes include water purification (both potable and waste), medical filtration, and gas separation, as well as a variety of industrial filtration.

(Ref:- A Brydson, D. N. Gray, McGraw-Hill, Solvay)