Polyether sulphone

Figure 2 Bright-field TEM image of polyether sulphone inclusions (dark objects see arrows) in a polystyrene matrix.

Polyether ether ketone (PEEK) and Polyether sulphone (PES) belong to the most recent developments in the field of technical high-performance polymers. Both possess very good thermal and mechanical properties, which can be further improved by reinforcing fibres. Their application is mainly in aircraft and space vehicles. 

Size exclusion chromatography (SEC) enables the determination of the molecular size of organic molecules. Samples were filtered through a 0.45 pm filter (Gelman Sciences Acrodiscs) prior to analysis. The membrane filter material was Super (Polyether-sulphone). 

Polymer Specimens. The materials used in this work were polyimide (PI),polyamide-imide (PAl), polyether-ether-ketone (PEEK), polyphenylene sulfide (PPS) and polyether sulphone (PES). The chemical formulas and physical properties of the specimen polymers are summarized in Table I. The specimen polymers, except PPS, were unfilled while the PPS specimen was filled with glass fiber of Uo wt. %. PAI and PES are amorphous polymer with considerably high glass temperature. The polymers, except PI, can flow at hi temperatures and allow the use of injection molding. 

One of the attractions of the fracture mechanics approach is that the results are geometry independent. This, of course, is subject to conducting tests with valid specimens that meet the dimensions criteria set out in the standards. Considerable work has been conducted with various materials to verify how appropriate these specimen size criteria are for specific polymers and to a.scertain how sensitive the test results are to changes in specimen dimensions and to deviations from the criteria. The specimen thickness is the geometric variable that is considered most, since it governs whether the fracture is plane-strain or not. The effect of specimen thickne.ss B on fracture parameters, e g., K, G, J. and CTOD. has been examined for uPVC [23.61], polycarbonate [23,63], HIPS [64], HOPE [37,59,60,], ABS [65], and ABS PC blends [74], The effect of a/IF on fracture toughness properties is also considered for some of these materials, e g, uPVC [25], HOPE [59.60], polyacetal [68], and polyether sulphone (PES) [70]. 

Polyphenylene Polyether sulphide ether/refone Polyphthalamide Polyimide Polyether-sulphone/ polyoryl-Polysulphone sulphone Liquid crystal Polyetherimide polymer ... 

Polyether sulphone Poly ether imide Poly-phenylene sulphide Polyether sulphone Polyether imide Poly-phenylene sulphide... 

Polysulphones The polysulphone family of polysulphone (PSU) and polyether sulphone (PES) is a TP based on sulphone derivatives, aiming at high heat-stability. PSU originated in the discovery of a method of producing high molecular weight aromatic polyethers. 

Hemodialysis units are usually hoUow-fibre devices with a membrane area of 0.5-1.5 m. The classical membrane material is regenerated cellulose, closest to the natural material. Other membranes include polyether sulphone (PES) and polysulphone (PS), which are made somewhat hydrophilic by blending with PVP, a necessary requirement to address the problems of biocompatibUity and fouhng by proteins [39]. The membranes are asymmetric (10—100 pm thick) with a narrow pore size distribution and the pore diameter less than 10 nm [17]. 

ACH aluminium chlorohydrate GAC granulated activated carbon PAG powdered activated carbon PDT pressure decay test TMP trans-membrane pressure PV pressure vessel O-I outside-inside I-O inside-out CA cellulose acetate PES polyether sulphone PVP polyvinylpyrrolidone PVDF polyvinylidene fluoride. Source Based on [91]. 

NTR-7450 Sulphonated polyether sulphone 58 70" Nitto Denko — Hydranautics... 

Current heat-resistant polymers are poly(phenylene sulphides), poly(phenylene sulphones), and polyether sulphones where phenylene groups of the linear chains are cross-linked by sulphur atoms or sulphone groups. ... 

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