Polyether Sulfone PES

Polyether sulfone is a high-temperature engineering thermoplastic with the combined characteristics of high thermal stability and mechanical strength. It is a linear polymer with the following structure  

PES has excellent resistance to aliphatic hydrocarbons, some chlorinated hydrocarbons, and aromatics. It is also resistant to most inorganic chemicals. Hydrocarbons and mineral oils, greases, and transmission fluids have no effect on PES. 

Refer to Table 2.22 for the compatibility of PES with selected corrodents. Reference [1] provides a more comprehensive listing. 

Medical appliances Qiemical plants Fluid handling 

The chemicals listed are in the pure state or in a saturated solution unless otherwise indicated. Compatibility is shown to the maximum allowable temperature for which data is available. Incompatibility is shown by an X. 

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Polyether sulfones (PES) are another class of engineering thermoplastics generally used for objects that require continuous use of temperatures around 200°C. They can also be used at low temperatures with no change in their physical properties. 

The two aluminum alkoxide primers on mild steel showed improved adhesion and better resistance to crack propagation with both the thermoplastic polyether-sulfone (PES) and the FM 300U thermoset epoxy adhesive. The titanium alkoxide exhibited the poorest resistance to crack growth, while tetrabutyl orthosilicate showed intermediate behavior between the two aluminum alkoxides and the titanium alkoxide. 

In addition to the polymer substrate, a series of binding resins made from polyamide and polyimide, polyphenylsulfide (PPS), polyether sulfone (PES) and/or silicone resin are necessary for applying the coating. Such substances like laminating agents (lithium polysilicate, aluminum phosphate and phosphoric acid) and various additives are also used. Included in these additives are emulsifiers and further processing aids (e.g. silicone oil). 

PEEK-based blends include grades with polyether-sulfone, PES Sumiploy SK1800 and SK1660) where SKI800 comprises PES dispersed in PEEK... 

The term HT-thermoplastics is used for polymers, which in the absence of fillers, have a continuous-use temperature above approx. 200 °C. In contrast, standard plastics, such as PVC, polyethylene or polystyrene, have continuous-use temperatures of the order of 100 °C. In addition to their high temperature stability, HT-thermoplastics, in general, possess good resistance to chemicals and usually also low flammability. Among the most important HT-thermoplastics are polyphenylene sulfides (PPS), polysul-fones (PSU), polyether sulfones (PES), polyether imides (PEI), polyetherether ketones (PEEK) and polyarylates (PAR). 

As host polymer matrices we used poly(alkyl methacrylate)s with various ester groups (methyl PMMA, ethyl PEMA, isopropyl PiPMA, normalpropyl PnPMA, isobutyl PiBMi normjdbutyl PnBMA), poly(methyl acrylate), polyethylene (PE), poly(vinyl chloride) (PVQ, poly(vinylidene chloride) (PVDQ, j lyfvinyl alcohol) (PVOH), polystyrene (PS), polycarbonate (PQ, phenolphthalein polyedier-ketone (PEK-Q, and phenolphthalein polyether-sulfone (PES-C). 

X = CO Phenolphthalein polyether-ketone (PEK-C) X = SO2 Phenolphthalein polyether-sulfone (PES-C)... 

The study considered here employed materials obtained from McDonnell Aircraft Co., through Dexter Hysol, under the Air Force program Development of Ultra Lightweight Materials . They contained the Courtaulds Research Apollo 45-850, consisting of 5 pm diameter carbon fibers in Dexter Hysol s HC 9106-3 di-, tri- and tetrafunctional epoxy resin, toughened by addition of the thermoplastic polyether sulfone (PES). The thermoplastic PEIS toughening agent, present in this epoxy matrix, is presumed to phase separate out once it has cured. These panels were fabricated in an autoclave by Dexter Hysol. 

Table 6.5 Identification of the products in the flash Py-GC-MS of polyether sulfone (PES) ...

Li, Y., Cao, C., Chung, T-S. and Pramoda, K.P. 2004. Fabrication of dual-layer polyether-sulfone (PES) hollow fiber membranes with an ultrathin dense-selective layer for gas separation. 245 53-60. 

Polyether Sulfone (PES). Polyether sulfone is a transparent polymer with high temperature resistance and self-extinguishing properties. It gives off little smoke when burned. Polyether sulfone has the basic structure as shown in Fig. 2.39. 

From the overview presented above it can be found that there are numerous methods of preparation of polymeric photocatalytic membranes. However, it should be stressed that in case of polymer membranes there is always a danger of destruction of the membrane structure by UV light or hydroxyl radicals. This risk is associated with the reactor configuration. Application of a photocatalytic membrane requires irradiation of the membrane itself in order to perform the photodecomposition of pollutants. The lowest UV resistance is exhibited by membranes prepared from polyether-sulfone (PES) and polysulfone (PSU) (Chin et al, 2006 Molinari et al, 2000). This can be attributed to the fact that PES and PSU contain sulfone groups which are highly sensitive to UV light. Other membranes exhibiting low UV resistance are those made of polypropylene (PP), polyacrylonitrile... 

The postyield ductile fracture of polymers was extensively investigated (170-183), resulting in a conclusion that the crack is initiated from cavities growing from defects in the drawn material. These cavities have a rhombic shape with the long and short diagonals perpendicular and parallel to the draw direction. These cavities were observed in PVC, PE, polyethylene terephthalate (PET) at room temperature and in PC, PMMA, polyether sulfone (PES), and PS at elevated temperatures. At slow strain rates, the growth of these cavities in a plastically deformed material loaded in tension is stable until the critical size is reached resulting in an unstable catastrophic failure. 

Polyphenylene sulfide(PPS) Polyetheretherketone(PEEK) Polyether sulfone(PES) Pulmonary... 

The dope composition consists of two polymer components and two solvent components for each polymer, respectively. Polyether sulfone (PES) and PEO are selected as the two polymer components. Glycerin can serve as a solvent for one of... 

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