Dear Atiye Sadat Sadat Kachooei this is a very good and important technical question. Generally, PEEK polymer (= poly(ether ether ketone)) is known to be insoluble in all common solvents except concentrated sulfuric acid and hydrofluoric acid (not advisable because of the high toxicity of HF). However, there is a report that 4-chlorophenol can be used as alternative solvent for PEEK polymer. In this context please have a look at the following useful article:

A new solvent for poly(ether ether ketone)

https://www.researchgate.net/search.Search.html?type=publication&query=molecular%20tubes

This paper is freely available as public full text (see attached pdf file).

It might also be helpful to check the answers given to some closely related questions which have been asked earlier on RG:

How can I dissolve PEEK pellets and cast into films?

https://www.researchgate.net/post/How_can_I_dissolve_PEEK_pellets_and_cast_into_films

(9 answers)

and

Is any solvent available to dissolve PEEK pellets?

https://www.researchgate.net/post/Is_any_solvent_available_to_dissolve_PEEK_pellets

(23 answers)

I hope this helps. Good luck with your research and best wishes, Frank Edelmann

Hi,

an ohter possbile solvent could be Hexafluoroisopropanol. It works also with PET und PA which are normal also hardly soluble in any solvent. But I'm not sure about PEEK and HFIP.