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Polysulphonates aliphatic

Tension Above materials plus High-density polyethylene Polypropylene Acetal polymers Aliphatic polyamides (nylons) PPO Poly(ethylene terephthalate) Polysulphones... [Pg.191]

The polymer structure bears a clear resemblance to that of the polycarbonate of bis-phenol A and of the polysulphones so that there are a number of similarities between the materials. The greatest difference arises from the substantial aliphatic segment, which enhances chain flexibility and hence leads to comparatively low softening points. This has placed severe restrictions on the value of these materials and they have found difficulty in competing with the more successful polycarbonates. [Pg.607]

The use of PBT as an engineering material is more a consequence of a balance of good properties rather than of a few outstanding ones. It does not possess the toughness of polycarbonate, the abrasion resistance of an aliphatic polyamide, the heat resistance of a polysulphone, polyketone or poly(phenylene sulphide) or... [Pg.725]

The polysulphones have good resistance to the effect of acids, alkalis, engine oils, oil products and aliphatic hydrocarbons. [Pg.141]

Modified silicon-containing polycarbonates have been prepared in solution and their transition temperatures assessed. Block copolymers of bisphenol-A-polycarbonate-bisphenol-A-polysulphone and acrylates and methacrylates grafted onto polycarbonate film have also been prepared and evaluated, as have mixed polycarbonate systems based on 2,2 -bis(4-hydroxyphenyl)propane, 2,2 -bis(4-hydroxy-3,5-dibromophenyI)propaneandtetrabromophenophthalein. Molecular relaxations in aliphatic polycarbonates have been studied by the method of thermally-stimulated currents and the thermal ageing of polycarbonates based on polycyclic diphenols has been assessed by studies of mechanical properties. [Pg.91]

Polysulphones are polymers which contain recurring sulphone groups (-SO2-) in the main chain. Aliphatic polysulphones, prepared by reaction of sulphur dioxide with olefins, have been known for many years but lack of thermal stability has precluded any commercial utilization. In 1958 the preparation of stable aromatic polysulphones was described [5] and since this time a large number of such polymers has been investigated. However, at the present time, the only aromatic polysulphone to have achieved commercial significance is that prepared from 2,2-bis(4 -hydroxyphenyl)propane (bisphenol A) and 4,4 -dichlorodiphenyl sulphone. Only this polysulphone, manufacture of which was started in 1965 by the Union Carbide Corp. (U.S.A.), is described in this chapter. [Pg.403]

The polysulphone is amorphous and is soluble in aromatic and chlorinated hydrocarbons, esters and ketones aliphatic hydrocarbons have no effect. The polymer is very resistant to most aqueous reagents, including acids, alkalis and detergents concentrated sulphuric acid causes degradation and dissolution. [Pg.404]


See other pages where Polysulphonates aliphatic is mentioned: [Pg.146]    [Pg.134]    [Pg.279]    [Pg.7753]    [Pg.65]    [Pg.42]    [Pg.283]    [Pg.504]   
See also in sourсe #XX -- [ Pg.884 , Pg.885 , Pg.886 , Pg.887 ]




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