Polyetherketones

<h2 id="synthesis">Synthesis</h2>
<p>Polyetherketones can be obtained by condensation of <a href="/facts/4%2c4%2527-Difluorobenzophenone/6egUEPkP">4,4′-difluorobenzophenone</a> and potassium or <a href="/facts/Sodium_salts/LXG4MG7W">sodium salt</a> of <a href="/facts/Hydroquinone/QQ5EfwCF">hydroquinone</a>:
</p>

<h2 id="types">Types</h2>
<p>The most common of these high-temperature resistant materials is <a href="/facts/Polyether_ether_ketone/tUz9uX9U">polyetheretherketone</a> (PEEK).
</p><p>Other types of polyetherketone are:
</p>
<ul><li><a href="/facts/Polyetherketoneketone/EwJEu29H">PEKK</a> = Polyetherketoneketone</li>
<li>PEEKK = Polyether ether ketone ketone</li>
<li>PEKEKK = Polyetherketoneetherketoneketone</li></ul>
<h2 id="applications">Applications</h2>
<p>Space and aviation: aircraft parts (fins, wing flaps, nose caps, seats). Replacements for metal parts, also in the <a href="/facts/Military/kgNmLUnN">military</a> field.
</p><p>Machinery and automotive industry: high-performance molded parts such as <a href="/facts/Bearing_(mechanical)/Tb8HmHWt">bearing</a> cages, <a href="/facts/Gear/9KVHRfUR">gears</a>, sealing rings, valve spring retainers, <a href="/facts/Impeller/5TVgMdvu">impellers</a>. Coatings when high resistance to temperatures above 200 °C is required. Coatings made of PEEK or PEK, for example, are suitable for applications up to 230 °C (450 °F).<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a>
</p><p>Electronics industry: wire and cable <a href="/facts/Insulator_(electricity)/SfSXkrh5">sheathing</a>, flexible <a href="/facts/Printed_circuit_board/muSR2p43">printed circuit boards</a>, <a href="/facts/Semiconductor/zFf3mGTE">semiconductor production</a>, offshore connectors.
</p><p>Medical technology: <a href="/facts/Endoscope/oIXca2vs">endoscope</a> handles, hip joint <a href="/facts/Prosthesis/odTuXtC0">prostheses</a>.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> Because polyetherketones can be <a href="/facts/Sterilization_(microbiology)/ajVXFl7a">sterilized</a> without damaging them, PEK is often used for surgical applications.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
</p>
<h2 id="properties">Properties</h2>
<p>PEK has a high <a href="/facts/Thermal_resistance/N7VLrDAf">temperature resistance</a>. It is also characterized by high wear resistance.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> In addition, polyetherketones are highly resistant to chemicals: They are resistant to non-oxidizing <a href="/facts/Acid/FySU18n1">acids</a>, <a href="/facts/Grease_(lubricant)/SoG6pwuV">grease</a>, <a href="/facts/Lubricant/9PXISDwU">lubricants</a>, <a href="/facts/Water_vapor/DX5IUFG0">water vapor</a>, hot water, and concentrated <a href="/facts/Alkali/s6NqPGSP">alkalis</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a>
</p>
<h2 id="literature">Literature</h2>
<ul><li>Beland, S. (1990). <i>High performance thermoplastic resins and their composites</i>. William Andrew.</li>
<li>Díez-Pascual, A. M., Naffakh, M., Marco, C., Ellis, G., & Gómez-Fatou, M. A. (2012). High-performance nanocomposites based on polyetherketones. <i>Progress in Materials Science</i>, <i>57</i>(7), 1106–1190.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"TriboShield® Low Friction Polymer Coatings | GGB". www.ggbearings.com. Retrieved 2022-05-11. <a href="https://www.ggbearings.com/en/our-products/polymer-coatings/triboshield-low-friction-coatings" target="_blank">https://www.ggbearings.com/en/our-products/polymer-coatings/triboshield-low-friction-coatings</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Pye, Andy (2017-02-10). "Operating at PAEK performance: an overview of polyaryletherketones". Prospector Knowledge Center. Retrieved 2022-05-11. <a href="https://knowledge.ulprospector.com/5912/pe-paek-polyaryletherketones-overview/" target="_blank">https://knowledge.ulprospector.com/5912/pe-paek-polyaryletherketones-overview/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Panayotov, Ivan Vladislavov; Orti, Valérie; Cuisinier, Frédéric; Yachouh, Jacques (2016-07-01). "Polyetheretherketone (PEEK) for medical applications". Journal of Materials Science. Materials in Medicine. 27 (7): 118. doi:10.1007/s10856-016-5731-4. ISSN 1573-4838. PMID 27259708. S2CID 44295083. <a href="https://pubmed.ncbi.nlm.nih.gov/27259708/" target="_blank">https://pubmed.ncbi.nlm.nih.gov/27259708/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>"Polyether Ether Ketone (PEEK): Properties, Production & Apps - Matmatch". matmatch.com. Retrieved 2022-05-11. <a href="https://matmatch.com/learn/material/polyether-ether-ketone-peek" target="_blank">https://matmatch.com/learn/material/polyether-ether-ketone-peek</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>"Overview of materials for Polyetheretherketone, Unreinforced". www.matweb.com. Retrieved 2022-05-11. <a href="https://www.matweb.com/search/datasheet_print.aspx?matguid=2164cacabcde4391a596640d553b2ebe" target="_blank">https://www.matweb.com/search/datasheet_print.aspx?matguid=2164cacabcde4391a596640d553b2ebe</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
</ol>

Polyetherketones open-in-new

Polyetherketones