PEEK is quite resistant to organic solvents. You have to use acid digestion (for example with H2SO4) followed by solution casting or spray coating method to achieve a thin film.
Dear Prabaha Sikder , as Muhammad Zahid explained very harsh solvents are necessary to solubilize PEEK, but some alternatives have been already suggested in RG, please have a look to the following links:
https://www.researchgate.net/post/Is_any_solvent_available_to_dissolve_PEEK_pellets
https://www.researchgate.net/post/How_can_I_dissolve_PEEK_pellets_and_cast_into_films
Additionally, may be you could find useful the elegant approach followed by Aristizábal et al, where they created a soluble PEEK precursor, which can be dissolved in a mixture of tetrahydrofuran and N,N-dimethylacetamide to make a membrane and then transform the precursor to PEEK with a water acidic solution.
Here is the link to their work:
Article Preparation of PEEK Membranes with Excellent Stability Using...
Hope it helps.
Dear Prabaha Sikder please have a look at the following potentially useful patent literature:
Microporous PEEK membranes and the preparation thereof
https://patents.google.com/patent/US4992485A/en
Manuel Gómez, Thank you so much for your detailed answer. All the links you shared are very helpful. I will use 4 chloro phenol and see that is working out.
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