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US 11,465,103 B2Granted
Aqueous phase separation method
AssigneeUniversiteit Twente
InventorWiebe Matthijs de Vos
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Abstract
The invention is in the field of methods for preparing polymer films, and of such polymer films. The method involves phase separation and requires only aqueous solution, eliminating the need for organic solvents. The aqueous phase separation involves contacting a polymer solution comprising a trigger-responsive polymer with an aqueous coagulation solution in which the trigger-responsive polymer is not soluble.
Claims13
A method for creating a porous film through aqueous phase separation, the method comprising the steps of:
- I) providing an aqueous polymer solution comprising a dissolved trigger-responsive polymer wherein the trigger-responsive polymer is responsive to a change in pH, and wherein at least 80% of the solvent is water;
- II) contacting the aqueous polymer solution with an aqueous coagulation solution in which the trigger-responsive polymer is not soluble, and wherein at least 80% of the solvent of the aqueous coagulation solution is water, and wherein the aqueous coagulation solution has a suitable pH difference from the aqueous polymer solution to cause a transition from soluble to insoluble for the trigger-responsive polymer, allowing an entirely aqueous phase separation process;
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- III) allowing solvent exchange between the aqueous polymer solution and the coagulation solution to form a porous film.
1 more element
Dependencies are inferred from the claim text.