The dense membranes in question are cast by phase inversion, using THF as a solvent. The goal of course is to obtain a dense polymeric membrane. However, some "pores" are formed. This could be due to the presence of a non-solvent such as water (
Its important that you indicate the name of the polymer used for membrane fabrication as well as the method of membrane casting. Generally to obtain dense membranes, dry phase inversion method should be employed. However, its difficult to avoid pores if water is present in your polymer solution. Upon evaporating or drying the membrane, the space occupied by water will be the pores in the membrane. Similar case can be seen in wet phase inversion, where non-solvent or coagulants are used for solvent mass exchange.
i have the same problem .... i tried to increase the concentration to get a dense polymer without pores ...... but i cant
i still got my polymer with pores and the molds with curved surface
although i am using very dry THF ( without water ) , i am still getting it in irregular form
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