Phase inversion is done by casting the film in one solvent and after film is almost steady place the film on glass plate in a solvent in which the residual solvent in film mixes by diffusion and the solvent from bath enters the pores by mutual exchange.PVA film from water can be exchanged with alcohol.

Dear Asit Baran Samui,

Many thanks for your kind answer

I agree with you, but I need to know If it's possible, the pourcentage of each compounds 'PVA, water and Alcohol".

If you have some documents about this subject

Thank you in advance for your help

Best regards

Hi,

You can try different concentration of PVA in water. regarding ethanol as a non-solvent bath you can try from 100% ethanol to 50% ethanol. Also, you can try other alcohols as a coagulation bath. But this will give you more dense structure.

I hope this is helpful.

Hi Parimal, Many thanks for your kind answer, It's very helpful;

I have tried this but I did'nt get a poreuse membrane , If you have any document or paper talking about this subject.

Many thanks in advance

Best wishes

Dear Tarik, may be its late answer but i hope it will be useful 

You could prepare PVA membrane using water as a solvent, NaOH and Sodium Sulfate solution as coagulation bath 

You could check this Ref.s 

Dear Asmaa,

Many thanks for your answer, It's very helpful . I appreciate this.

May be we can discuss more about this subject if you like .

Best wishes

Tarik