Poly sulphones properties

Mechanical properties of the membranes were preliminarly tested and compared to those exhibited by cell-free poly-sulphone fibres. The Young modulus, E wet, and the ultimate properties of the membranes were estimated by a stress-strain analysis carried out on a Instrom Universal Tester. The average value of the Young modulus was found lower by a factor of about 2.5 relative to the average value of the cell-free fibres. 

Zhang P, Qian JW, An QF, Du BY, Liu XQ, Zhao Q (2008) Influences of solution property and charge density on the self-assembly behavior of water-insoluble polyelectrolyte suUbnated poly(sulphone) sodium salts. Langmuir 24 2110-2117... 

When rare-earth-metal ions such as Eu and Tb are bound to polyelectrolyte membranes such as poly(sodium acrylate) and poly(sodium ethene-sulphonate) their fluorescence intensities are considerably enhanced this is associated with the formation of asymmetric bonds between the rare-earth ions and the acrylate/S03 groups in the polymers. This was confirmed by the addition of EDTA to the Tb -poly(sodium acrylate) complex which, because of its preferential binding to the polymer, displaced Tb ions and resulted in reduced fluorescence of the latter. Stokes shifts of fluorescent dyes in different polymer systems have been related more to mobility effects in the polymer than polarity,and the fluorescence of hydrolysed aspirin has been found to be affected by the nature of different polymer supports.The luminescence properties of cis-(2,2 -bipyridyl)ruthenium(ii) complexes have been found to be influenced by binding the complex to a polymer matrix,as have the luminescence properties of flavones and l-octadecyl-3,3-dimethyl-6 -nitrospiro(indoline-2,2 -2H-benzopyran). Other studies of interest in-... 

An extensive study on anticorrosion properties of PANI, PPy and PEDOT used as additives was reported in [88]. Results indicate that the protection against corrosion imparted by the formulations modified by the addition of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulphonate), PANI-ES and, especially, PANI-EB is significantly higher than that of the unmodified epoxy paint. Thus, results evidence that some CP compositions can inhibit the steel corrosion and, therefore, small concentrations of these materials would be used to replace conventional inorganic corrosion inhibitors currently used in primer paints. In Table 10.6, some examples of the... 

Sulfonated polybenzoimidazole (sPBI) membranes have also been prepared by poly condensation of 2-sulphoterephthalic acid with 1,2,4,5-tetraaminobenzene tetrahydrochloride [193] or by grafting alkyl or aryl sulfonates on to the imidazole ring [194]. ABPBI was sulphonated by immersion in sulfuric acid followed by heat treatment at 450 °C [195]. Other methods of sulphonation have been reviewed by Asensio et al. [196], along with a detailed description of the properties of PBI blends with sulfonated and non-sulfonated polymers, and block PBI copolymers. 

O. Stephan, P. Schottland, P. Y. Le Gall, C. Chevrot, C. Mariet, M. Carrier, Electrochemical behaviour of 3,4-ethylenedioxythiophene functionalized by a sulphonate group. Application to the preparation of poly(3,4-ethylenedioxythiophene) having permanent cation-exchange properties, Journal of Electroanalytical Chemistry 1998, 443, 217. 

Most types of Hot melt adhesives used in the mannfacture of laminates and in rapid Packaging industry applications are mineral oil-derived, hydrophobic and essentially non-dispersible, so they cannot be considered as renewable. However, some basic polymers have been prepared over the last decade from vegetable sources, which are renewable, and are adhesive, although these properties have limitations. These include poly(hydro-xybutyrate/hydroxyvalerate) (PHBV), poly(lactide) (which has poor thermal stability), and starch esters. Adhesives based on sulphonated polyesters with polar petroleum waxes have improved adhesion and adequate water dispersibility. In general, however, the perfect adhesive from renewable resources with satisfactory adhesion properties remains to be discovered. 

Firebrake ZB 415 with Dechlorane Plus gives flame-retardant properties superior to those of antimony oxide alone. Grade ZB 500 makes it possible to suppress fumes from fluoropolymers, and gives good flame-retardant properties to poly(ether ketone)s and polyfether sulphone)s. Other key applications are talc-reinforced PP replacing PVC. ABS, and PA 66 in electrical/electronic applications, and EVC cable compounds. 

New Polymers and Other Modes of Deformation.—Three relatively new polymers have become available recently poly (ether ketones), poly (ether ether ketones) and poly(ether sulphones). Poly(ether ether ketones), (PEEK), have good electrical insulating properties and very good abrasion resistance. This combination makes the polymer an attractive coating for electrical conductors. The same polymer is also attractive as a load bearing material for moving parts. Poly(phenylene sulphide) continues to be developed for this purpose but the PEEKS are much simpler to fabricate. Linear low-density polyethylenes are expected to be widely available in the near future. These materials have many attractive features, particularly as packaging materials. 

Poly(ethylene terephthalate) is most usually encountered in the crystalline form and, as such, it is soluble at normal temperatures only in proton donors which are capable of interaction with the ester group. Effective solvents of this kind are chlorinated and fluorinated acetic acids, phenols and anhydrous hydrofluoric acid. The polymer is soluble at elevated temperatures in various organic liquids, which include anisole, aromatic ketones, dibutyl phthalate and dimethyl sulphone. Chloroform has the peculiar property of dissolving amorphous poly(ethylene terephthalate) at temperatures below 0°C,but on warming such solutions the polymer separates in crystalline form. Chloroform is without effect on polymer which has already been crystallized. 

Dai H, Zhang H, Zhong H et al (2010) Properties of polymer electrolyte membranes based on poly(aryl ether benzimidazole) and sulphonated poly(aryl ether benzimidazole) for high temperature PEMFCs. Fuel Cells 10 754-761... 

Property Polysul- phone Udel Poly ether sulphone Victrex Poly- phenylene sulphide Ryton Polyether- imide Ultem Ultem +20% glass reinforced... 

Lakshmi, R.T.S.M., Meier-Haack, J., Schlenstedt, K., Komber, H., Choudhary, V., Vatma, 1. (2006) Synthesis, characterisation and membrane properties of sulphonated poly(aryl ether sulphone) copolymers. Reactive and Functional Polymers, 66, 634-644. 

---