Thermoplastics polysulfone

Amorphous Thermoplastics. Polysulfone, polyethersulfone, and polyarylsulfone are examples of amorphous thermoplastics. These materials have high Ts and can stand temperatures up to 200°C for a long period of time. Amoco and ICI are principal suppHers of this class of material. 

Speciality thermoplastics polysulfone (PSU), PPS, fluoroplastics, PEEK, PEI, polyamide imide (PAI), liquid crystal polymers (LCP). 

Polyarylsulfones are a class of high-use temperature thermoplastics that characteristically exhibit excellent thermal-oxidative resistance, good solvent resistance, hydrolytic stability, and creep resistance (10). In 1965, Union Carbide announced a thermoplastic polysulfone based on dichlorodiphenylsulfone and bisphenol A (11). This polysulfone became commercially available in 1966 and was designated as Udel polysulfone. Since 1966, Imperial Chemical Industry (ICI), Minnesota Mining and Manufacturing (3-M), and Union Carbide have commercialized polyarylsulfones that contain only aromatic moieties in the polymer structure. These materials have been designated Vlctrex polyethersulfone (ICI), Astrel 360 (3-M), and Radel polyphenylsulfone (Union Carbide). 

Another (family of linear aromatic polymers is the polysulfones. They are tough, high-temperature-resistant engineering thermoplastics. Polysulfones may be synthesized by the nucleophihc substitution of alkali salts of biphenates with activated aromatic dihalides. A typical example is the preparation of bisphenol A polysulfone (21) from the reaction of disodium salt of bisphenol A with dichlorodiphenyl sulfone ... 

The Japanese researchers report [ 175-179] on the syntheses of aromatic polysulfones via the method of polycondensation in the environment of polar dissolvent (dimethylformamide, dimethylacetamide, and dimethylsulfoxide) at 60-400 °C in the presence of alkali metal carbonates within 10 min to 100 h. The s mthesized thermoplastic polysulfones possess good melt fluidity [175]. 

Thermoplastic Polysulfones Strength at High Temperatures. Chem. Eng. Progr, (1965). 72(10), 108-110. 

Polysulfones have been made from acetylene-terminated sulfone monomers (Fig. 3.51), and cured graphite-fiber laminates have shown Tg = 300°C and good mechanical properties at 170°C before and after heat and humid aging. Semi-interpenetrating polymer networks with linear thermoplastic polysulfones showed promise of combining the heat deflection temperature and solvent-resistance of the thermoset polymer with the impact resistance of the thermoplastic. 

Fig. 12-5. Milking machine parts. The thermoplastic, Polysulfone, was selected by the Zero Manufacturing Company because of its superior resistance to chlorinated cleaning solutions, light weight, and toughness.

Design Criteria for a New Heat Resistant Thermoplastic-Polysulfone"... 

In 1965 A.G. Farnham and R.N. Johnson of Union Carbide (this business was acquired by Amoco Polymers in 1986 and is currently part of Solvay Advanced Polymers) announced the preparation of thermoplastic polysulfones, PSU [25]. Tlie first commercially available polysulfone was prepared by the nucleophilic aromatic displacement of the chlorides on 4,4 -dichlorodiphenyl sulfone, DCDPS, by the anhydrous di-sodium salt of BPA. The reaction is conducted in a dipolar aprotic solvent, such as dimethyl sulfoxide. This polysulfone, PSU, was commercialized in 1966 under the Udel trademark. This amorphous polymer exhibits a of 186°C. The structure of PSU is shown in Fig. 1.11. 

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