Hi Rambabu,

An easy way to obtain such kind of membranes is by wet phase inversion, using a water coagulation bath and a colloid solution prepared with PES-C in NMP. You should check the work of Wei-na Sun (Chinese Journal of Polymer Science Vol. 27, No. 2, (2009), 165−172) and Xin Li (Journal of Membrane Science 314 (2008) 206–211) among others.

Hi Ram Babu,

Wet Phase Inversion Method -

Make a solution of PES in NMP. Prefreably 10-15 % solution i.e., 1g in 10 ml and like wise.

Cast the membrane using doctor blade/ membrane applicator on a glass plate, after 20 sec , Immerse the plate in deionized water, for 1 hour, and then immerse the plate in IPA for another 1 hour.

Dry the membrane in Vacuum oven at 70'C overnight.

Thats it.

Play with parameters for variation.

Thanks,

Dear Rambabu,

Closely related PEK-C (alternative name PEEK-WC) membranes can be prepared either by wet phase inversion or dry phase inversion to get asymmetric dense or porous membranes, or by solvent evaporation to get symmetric dense membranes. A very complete overview is given in the attachment. Please see references therein for the exact procedures.

I have no personal experience with PES-C, but I have enough experience to know that everything thas is valid for PEK-C is in principle valid for PES-C. Depending on the polymer grade (molar mass etc.) you will have to do some optimization of the best preparation conditions.

Unfortunately I have no information on possible producers of the polymer or commercial membranes.

Kind regards,

John Jansen