Polyetherether ketones

Non-Metallic Materials Numerous engineering thermoplastics have been commercialised including materials such as polyetherether ketone (PEEK) and polyether sulphate (PES) with much improved thermal/chemical resistance. The usage of FRP equipment has increased, and fluoropolymer lining technology/applications have come of age. Of particular interest is the development of stoved, fluoropolymer coating systems for process industry equipment. 

AS4/PEEK ICI Americas Inc. ICI Polyetherether ketone, semicrystalline thermoplastic... 

An engineering plastic core was found preferable examples included polyetherether ketone (PEEK), polyphenylene sulfide (PPS), and polyether imide (PEI). Polytetrafluoroethylene bearers were placed in the mold to keep the core material away from the walls of the mold. No special cavity modifications were required. Any hot-melt fluoroplastic could be molded surrounding the insert examples include PVDF, FEP, ETFE, PFA, ECTFE, and PCTFE. 

Industrially this is often called a polyetherether ketone to emphasize the ether character hence the abbreviation PEEK. In actuality it is a polyarylether ketone. 

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). 

The major applications of LCP films in electronics are multilayer boards and multichip modules, and flexible printed circuits. Current materials used in the.se applications include polyimide film, high performance thermoplastic film such as polyphenylene sulfide and polyetherether ketone, and fiber reinforced composites such as quartz fiber-polyimide. The price of these materials for electronic packaging is in the range of. 50 to. l(K)/lb, so LCPs can compete very effectively at their current prices. Based on a two to three times increase in price... 

PEEK PES PET PEK PMMA Polyetherether ketone Polyether sulfone Polyethylene terephthalate Polyetherketone Polymethylmethacrylate UP Unsaturated polyester... 

A.C. Martin, N. Lakhera, A.L. DiRienzo, D.L. Safranski, A.S. Schneider, C.M. Yakacki, et al., Amorphous-to-crystalline transition of polyetherether-ketone-carbon nanotube composites via resistive heating. Composites Science and Technology, 89,110-119, 2013. 

While the overall growth of composites in the aerospace industry is continuing, epoxy has been facing stiff competition from other materials and the growth rate has been relatively small (2% annually). While epoxies are still used in many exterior aircraft parts, carbon fiber composites based on bismaleimide and cyanate esters have shown better temperature and moisture resistance than epoxies in military aircaft applications. In the commercial aircraft arena, phenolic composites are now preferred for interior applications because of their lower heat release and smoke generation properties during fires. High performance thermoplastics, such as polysulfone, polyimides, and polyetherether ketone (PEEK), have also foimd some uses in aerospace composites. 

Nisitani H, Noguchi H and Kim Y H (1992) Evaluation of fatigue strength of plain and notched specimens of short carbon-fiber reinforced polyetheretherketone in comparison with polyetherether-ketone, Eng Pract Mech 43 685-705. 

Complementary HPLC-MS has also applied to structure elucidation in other polymers including polyethylene terephthalate [10], phenol oligomers [11], phosphoric acid containing polyarylene ethers [12], isocyanates [13], polyurethanes [14], polyamindoamine dendrimers [15], N-isopropyl acrylamide [16], oligo-(phenylene-vinylene) dimer [13], polyetherether ketone [17] and carbon blacks [18]. 

Blends of BPADA-based Pis are also miscible with polyaryl ether ketones such as polyetherether-ketone (PEEK). As injection molded, many PEEK-PEI blends are transparent. 

Polyetherether Ketones, Polysulfones, and Acetal Resins. The poly(etherether ketones), or PEEK, can be prepared by condensation of the dipotassium salt of hydroquinone or bisphenol A with 4,4 -difluorodiphenyl ketone at temperatures in excess of 300 C. 

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