Patent ID: 11883792
Assignee: KING FAISAL UNIVERSITY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method for preparing a porous polypropylene thin film, the method comprising:
dissolving polypropylene in an organic solvent to form a solution under reflux condition;
stirring the solution for about 5 to about 30 minutes;
adding a cavity forming agent to the solution and mixing the solution until the cavity forming agent is well-dispersed therein, thereby forming a well-dispersed solution;
placing a solid substrate onto a spin coating holder or chuck;
applying the well-dispersed solution onto the solid substrate through spin coating to form a thin film on the solid substrate;
collecting excess materials of the polypropylene and the organic solvent in a drain connected to a receiver;
removing the solid substrate with the thin film formed thereon from the spin coating holder or chuck;
subjecting the formed thin film to post-heat;
peeling the thin film off the solid substrate; and
extracting the cavity forming agent from the peeled thin film by washing the peeled thin film in an aqueous or nonaqueous solvent, thereby obtaining a porous polypropylene thin film with cavities, macro-voids, and micropores.