Polyetheretherketone plastic

Acrylic ESTER POLYMERS Acrylonitrile POLYMERS Cellulose esters). Engineering plastics (qv) such as acetal resins (qv), polyamides (qv), polycarbonate (qv), polyesters (qv), and poly(phenylene sulfide), and advanced materials such as Hquid crystal polymers, polysulfone, and polyetheretherketone are used in high performance appHcations they are processed at higher temperatures than their commodity counterparts (see Polymers containing sulfur). 

Velisaris, C. N. Seferis, J. C. "Thermal Processing and Characterization of Polyetheretherketone (PEEK) Matrices," Plastics 85, Proceedings of the SPE 43rd Annual Technical Conference and Exhibition, 1985. 

Monolithic columns are another approach to provide lower pressure drops and higher rates of mass transfer. These are continuous solid columns of porous silica stationary phase instead of packed particles. Like perfusion packings, they have a bimodal pore structure (Figure 21.7). Macropores, which act as flowthrough pores, are about 2 fim in diameter. The silica skeleton contains mesopores with diameters of about 13 nm (130 A). It can be surface modified with stationary phases like Cig. The rod is shrink-wrapped in a polyetheretherketone (PEEK) plastic holder to prevent waU effects of solution flowing along the walls. The surface area of the mesopores is about 300 mVg, and the total porosity is 80%, compared with 65% for packed particles. The colunm exhibits a van Deemter curve approximating... 

Polyarylene Plastics - Examples of these plastics include polyetherketone, polyetheretherketone, polyetherketoneketone, polyphenylenesulfide, and others. 

In some cases, steel filters are undesirable. An analyte may adsorb to the steel or may decompose in the presence of steel. In these cases, plastic frits made from PEEK (polyetheretherketone) or polyethylene can be substituted for the stMl filters. They are not as strong as steel frits and are not completely compatible with all mobile phases. Polyethylene swells in solvents such as hexane, methylene chloride, or tetrahydrofuran (THE). PEEK also is incompatible with methylene chloride and THF. In combination with PEEK or glass tubing, these frits can be used for the construction of columns with a metal-free flow path. 

Spedalty plastics snch as PC, acrylonitrile-butadiene-styrene (ABS), PU, polyamides (PA), thermoplastic elastomers, polysnlfone and polyetheretherketone (PEEK) are being used in a nnmber of special applications in medical devices, whenever high performance is required. There are also a number of polymer blends used in this category (i.e., PC/ABS and PC/polyester), if property envelopes are required to be further improved. 

Typical plastics, including polymethylmethacrylate (PMMA), polycarbonate (PC), cyclic olefin copolymer (COC), polysulfone (PSU), polyetheretherketone (PEEK), liquid crystal polymers (LCP), polystyrene(PS), polyethylene terephthalate (PET), etc., have been used for microfluidics. COC is the most commonly used polymer, accounting for around 80 % of all applications, because of its good optical properties [2]. 

Reaction of the dipotassium salt of hydroquinone with 4,4 -difluorodiphenyl ketone yields the high-temperature resistant plastic polyetheretherketone (PEEK). 

Victrex D Polyetheretherketone, with glass or carbon fiber ICI Materials -Plastics/Victrex... 

Victrex PEEK Polyetheretherketone, PEEK reinforced or not ICI/LNP Eng. Plastics... 

A helical blade used in fluid compressors made of plastics, such as PTFE, PFA (perfluoroalkoxy resin), PEEK (polyetheretherketone), PES (polyether sulfone). 

Typical thermoplastic polymers as binders in HT-PEM bipolar plates are polyphenylensulfide (PPS), polyetheretherketone (PEEK), and derivatives of polyphenylsulfone (PSU). Looking at the plastics pyramid (Fig. 19.1), all of these polymers are in the upper right region of high temperature stability and semi-crystallinity. These polymers safely resist the acid and oxygen contact and provide heat deflection temperature far above the operating point of a high temperature PEM fuel cell. 

These materials also command premium prices and some require special processing. Examples are polyimides, polyetheretherketone, liquid-crystal polymers, polytetra-fluoroethylene, and polybenzimidazole (Odian GC (2004) Principles of polymerization. Wiley, New York Modern plastics encyclopedia, McGraw-Hill/Modern Plastics, New York). 

Haas TW. Polyetheretherketone (PEEK). In Rubin II, editor. Handbook of plastic materials and technology. NY Wiley-Interscience 1990. p. 277. 

Third, contrary to what many processors beUeve, most plastics do not melt in the true sense of the word. Melting rigorously means that energy can be added to a material in order to change its state (solid to fluid) without changing its temperature. This behavior is limited to a few thermoplastic materials, including polyethylenes, polypropylenes, some nylons, the acetals, and thermoplastic polyester (Fig. 10.10). [There are others, such as polyetheretherketone (PEEK) and polymethylpentene, but these are relatively uncommon materi s.]... 

Table 12.5 Wear Resistance Data of Plastic Against Steel (1018 C) of RTP 2200 Series Polyetheretherketone (PEEK) Compounds, Determined by Thrust Washer Test PerASTM D3702 [6]...

In general, polymers are much more resistant to attack by acidic and alkaline solutions than are metals. For example, hydrofluoric acid (HF) corrodes many metals as well as etch and dissolve glass, so it is stored in plastic bottles. A qualitative comparison of the behavior of various polymers in these solutions is also presented in Tables 17.4 and 17.5. Materials that exhibit outstanding resistance to attack by both solution types include polytetrafluoroethylene (and other fluorocarbons) and polyetheretherketone. 

Many engineering plastics are selected on the basis of other properties (mouldability, stiffness, temperature performance, etc.) and the suitability for adhesive bonding is unlikely to be considered in the first instance. Polyetheretherketone (PEEK), for example, is a very good engineering plastic with some excellent properties but, for the adhesive engineer, this is one of the most difficult materials to bond and will... 

Sheth, K. C. 2008. Polyetherimide-polyetheretherketone blends and misdbihty, ANTEC 2008, Proceedings of the 66th Annual Technical Conference Exhibition, Milwaukee, WI, 4-8.05.2008, Society of Plastics Engineers, pp. 890-894. 

As discussed in Section 7.2, PBI polymers can be compounded with many other high temperature plastics to make different PBI blends. Currently, four PBI-PEEK(polyetheretherketone) blends are commercially available under the following trade names ... 

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