Talk:Polyether ether ketone

Tensile Str / Youngs Modulus
Surely the tensile strength and Young's modulus of this material will depend heavily on the molecular weight of the polymer synthesised - Is it not wildly inaccurate to quote its tensile str[a{/e??}]ngth as 90MPa when, depending on the conditions for its synthesis, this could very easily be altered? Mattybhoy 69 (talk) 15:06, 5 January 2009 (UTC)

I have worked with PEEK for almost 30 years and written many papers and reviews on this subject. The information in the current version is pretty inaccurate and I am going to edit it very shortly. The tensile strength is 90 -100MPa and doesn't vary that much with useful molecular weight. Tg is 143C, Tmelt 343C. There is no Tg above 143C - although there are some transitions below room temp. Anyone who wants detailed numbers on PEEK should look at www.victrex.com - they make most of the worlds PEEk and have great literature. —Preceding unsigned comment added by Prajnaling (talk • contribs) 16:24, 13 February 2009 (UTC)

Glass Transitions
This is weird, I've just edited the page to reflect the fact that PEEK goes through two transitions as it is heated, both of them characterised by a falloff in storage modulus and a peak in loss modulus. I work in composites and I see this every day when analysing PEEK samples using Dynamic Mechanical Analysis (DMA). But I can't find any supporting evidence on the net, so I suppose the content I added, while true, is not 'verifiable'. I suppose I could put something on the net, say a couple of DMA traces, but it wouldn't be that authoritative and it would probably breach my company's information regs.

Please revert this page if you think my statements are unsupportable. Trent 900 00:36, 26 November 2006 (UTC)

There is only one Tg - at 143C. The melting peak by DSc is at ~340C. You might be seeing an effect of a low temperature melting peak which can occur just above any annealing temperature. This is due to the formation of small, imperfect crystal between the main lamellae during annealing. —Preceding unsigned comment added by Prajnaling (talk • contribs) 17:06, 13 February 2009 (UTC)

External Link
I added an external link to a great paper about the structure of PEEK. It was here before and an "overall editor" killed it as spam, but I found the .pdf so that there is no marketing-ese, just PEEK stuff. I hope others will review it (and tell me if I am wrong.) Rsteif 17:34, 12 December 2006 (UTC)

Information about PEEK
http://www.victrex.com/en/tech_data/literature.php

A. Lustiger, F. S. Uralil, G. M. Newaz:	Processing and structural optimization of PEEK composites, Polym Compos,	1990, 11, 5 - 75

S. Saiello, J. Kenny, L. Nicolais :Interface morphology of carbon fibre/PEEK composites, J Mater Sci, 1990, 25, 3493 - 3496

M. J. Folkes, G. Kalay, A. Ankara: The effect of heat treatment on the properties of PEEK and APC2, Compos Sci Technol, 1993, 46, 77 - 93

P. Davies, W. J. Cantwell, P. Y. Jar, H. Richard, D. J. Neville, H. H. Kausch: Cooling rate effects in carbon fibre/PEEK composites

C. N. Velisaris, J. C. Sefris: Crystallization kinetics of polyetherketone (PEEK) matrices, Polym Eng Sci, 1986, 26, 1574 - 1581

S. L. Gao, J. K. Kim: Cooling rate influences in carbon fibre/PEEK composites, Part I. crystallinity and interface adhesion, Composites	A, 2000, 31, 517 - 530

S. L. Gao, J. K. Kim: Cooling rate influences in carbon fibre/PEEK composites, Part II. interlaminar fracture resistance, Composites	A, 2001, 32, 763 - 774

S. L. Gao, J. K. Kim: Correlation between crystalline morphology of PEEK, interface bond strength and mechanical properties of carbon/PEEK composites, J. Appl. Polym. Sci., 2002, 84, 1155 - 1167

T. Y. Ko, E. M. Woo: Changes and distribution of lamellae in the spherulites of poly(ether ether ketone) upon stepwise crystallization, Polymer, 1996, 37, 7, 1167 - 1175

P. Cebe, S.-D. Hong: Crystallization behaviour of poly(ether-ether-ketone), Polymer, 1986, 27, 8, 1183 - 1192

Zhiyi Zhang, Hanmin Zeng: Effects of thermal treatment on poly(ether ether ketone), Polymer, 1993, 34, 17, 3648 - 3652

K. C. Cole, I. G. Casella: Fourier transform infra-red spectroscopic study of thermal degradation in poly(ether ether ketone)-carbon composites, Polymer, 1993, 34, 4, 740 - 745

D. C. Bassett, R. H. Olley, I. A. M. Al Raheil: On crystallization phenomena in PEEK, Polymer, 1988, 29, 10, 1745 - 1754

R. H. Olley, D. C. Bassett, D. J. Blundell: Permanganic etching of PEEK, Polymer, 1986, 27, 3, 344 - 348

A. A. Mehmet-Alkan, J. N. Hay: The crystallinity of PEEK composites, Polymer, 1993, 34, 16, 3529 - 3531 —The preceding unsigned comment was added by 80.243.168.94 (talk) 10:54, 14 February 2007 (UTC).

2nd glass transition?
I have worked with PEEK for the past few years and has as yet not seen this second glass transition that is mentioned on this link when using thermal analysis techniques such as DSC. It would be interesting to know what type of samples of PEEK the author have been analysing using DMA. --17:22, 21 March 2007 (UTC)
 * I've been wondering myself about whether it is a true glass transition or not. Feel free to change if you disagree. But in DMA the two transitions are very obvious - two definable onset points for a decrease in flex store modulus and two peaks in flex loss, at about 150 and then again at 300 or so celsius. I have been working with a variety of PEEKs for gas turbine engines, the most common one being Arlon, a Greene Tweed PEEK. Trent 900 22:28, 4 April 2007 (UTC)

The process at 150 is the real Tg. At 300C you a probably seeing the onset of the melting process. Remember that polymers melt over a range of temperature - reflecting the range of size and perfection of the crystals. In DSC it is common to see some melting starting around 300C. Prajnaling (talk) 20:15, 14 February 2009 (UTC)

Requested move
Full names are more appropriate for titles than acronyms --134.174.140.200 21:44, 21 June 2007 (UTC)
 * Naming conventions (abbreviations) indicates that the acronym may be used if it is the more common name. When working with this material I have only ever heard it referred to as PEEK and most people who work with it only occasionally don't even seem to know what it stands for (these same people often find the full name to be less than helpful in understanding what is being discussed). For this reason I think this particular article is better located at the acronym. Stardust8212 22:46, 21 June 2007 (UTC)
 * I disagree. If you look under PTFE which is more common than PEEK it is spelled out fully. I vote for the fullname and having a redirection from PEEK. --Kupirijo 23:18, 22 October 2007 (UTC)
 * That could be taken to mean PTFE should be swapped over, not PEEK. It does not matter very much either way although the reality is people will look up the acronym and not the full name.  I say leave PEEK as it is unless someone comes up with a compelling reason to change it. Man with two legs 07:32, 23 October 2007 (UTC)


 * I have been working with it (as an end user) for 5+ years and have never heard it referred to by anything OTHER than PEEK. I would say that PEEK at this point is by far the more common name. Ken (talk) 21:20, 5 March 2013 (UTC)

Williamson ether synthesis
Shouldn't there be a link to the ether synthesis page? --Kupirijo 23:19, 22 October 2007 (UTC)

Ketron??
WTF has Ketron to do with this?? — Preceding unsigned comment added by 89.180.13.0 (talk) 20:41, 24 September 2013 (UTC)

Probably misleading regarding ICI. Victrex was a spun off company
The intro says:
 * It was originally introduced by Victrex PLC, then Imperial Chemical Industries (ICI) in the early 1980s

-as per the reference

However I think this should be:
 * It was originally introduced by Victrex PLC, then Imperial Chemical Industries (ICI), in the early 1980s

-with that extra comma. Or even:
 * It was originally introduced by Imperial Chemical Industries (ICI) in the early 1980s

Victrex was spun off by ICI and was incorporated in 1993. Man with two legs (talk) 20:41, 3 May 2020 (UTC)

Aryl not to be confused with acryl
The introduction paragraph says: Polyether ether ketone (PEEK) is a colourless organic thermoplastic polymer in the polyaryletherketone (PAEK) family, used in engineering applications.

This aryl in polyaryletherketone mustn't be confused with acryl. Steue (talk) 21:15, 24 January 2021 (UTC)

POV editorializing
"PEEK is considered a high-performance polymer, that is to say, its high price restricts its use to the most demanding applications only." Considered by who, Mr Weasel?71.63.160.210 (talk) 18:00, 18 June 2021 (UTC)

Commons files used on this page or its Wikidata item have been nominated for speedy deletion
The following Wikimedia Commons files used on this page or its Wikidata item have been nominated for speedy deletion: You can see the reasons for deletion at the file description pages linked above. —Community Tech bot (talk) 13:09, 19 May 2023 (UTC)
 * PEEK Bone Implant.jpg
 * PEEK Implant.jpg