Udel polysulphone

Estimate the crystalline melting point of UDEL polysulphone, structural formula ... 

Udel polysulphone was the first polysulphone to be introduced commercially by Union Carbide in 1965. It is prepared by the reaction of the disodium salt of bisphenol A with dichloro-diphenylsulphone... 

The first commercial polymer Table 21.3, II) was offered in 1965 by Union Carbide as Bakelite Polysulfone, now renamed Udel. In 1967 Minnesota Mining and Manufacturing introduced Astrel 360 Table 21.3, V), which they referred to as a polyarylsulfone. In 1972 ICI brought a third material onto the market which they called a polyethersulphone (III) and which they then marketed as Victrex. They also introduced a material intermediate between III and V known as Polyethersulphone 720P (IV) but which has now been withdrawn. In the late 1970s Union Carbide introduced Radel (VI), which has a higher level of toughness. Around 1986 Union Carbide sold their interest in polysulphones to Amoco. In addition the Astrel materials were produced by Carborundum under licence from ICI. 

A range of polysulphones has been prepared with a variety of bis-phenols other than bis-phenol A. As might be expected from the discussion in Chapter 4 and from experience with the range of polycarbonates (Chapter 20), replacement of the isopropylidene link with a methylene, sulphide or oxygen link depresses the Tg whilst —C(CgH5)2— and sulphone links raise it. The bis-phenol derived from norcamphor leads to a polysulphone with a Tg of 250°C (195°C for a Udel-type polymer). 

Routes to aromatic polysulphones were discovered independently and almost simultaneously in the early 1960 s in the laboratories of the 3H Corporation (3) and Union Carbide Corporation (6) in the USA and at the Plastics Division of ICI in the UK (4). All three companies have since commercialised their disciveries. In 1963 Union Carbide introduced Udel Polysulfone which is rated to have a continuous use tmp-... 

Polysulphone, Its chemical construction is illustrated in Fig. 1.3. A transparent thermoplastic in its original form. Service temperature of its products is up to about 150 °C. Resistant to hydrolysis (e. g. in repeated heat sterilization). Examples of applications transparent components of medical tools and instruments, electric switches, electronic parts. The industrial polysulphone is poly(ether-sulphone). Trade names Mindel (USA), Udel (USA). 

Polysulphone Udel Union Carbide 150 30-32 V-2.. . v-0 Injection grade... 

Polysulphone Udel P-1700 Hydrolytic stability General electrical Union Carbide... 

Polysulphone Udel P-6050 High impact strength Electronic/ electrical... 

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