US 11,883,792 B1
Process for preparing a polypropylene-based sponge-like porous thin film
Junaid Saleem, Al-Ahsa (SA); Safdar Hossain S K, Al-Ahsa (SA); Zubair Khalid Baig Moghal, Al-Ahsa (SA); and Gordan McKay, Al-Ahsa (SA)
Assigned to KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed by KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed on Sep. 1, 2023, as Appl. No. 18/241,612.
Int. Cl. B01J 20/26 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C02F 1/28 (2023.01); C08J 5/18 (2006.01); C08J 9/26 (2006.01); C09K 103/00 (2006.01); C09K 3/32 (2006.01); C02F 103/00 (2006.01); C02F 101/32 (2006.01)
CPC B01J 20/261 (2013.01) [B01J 20/28004 (2013.01); B01J 20/28033 (2013.01); B01J 20/3007 (2013.01); B01J 20/3064 (2013.01); B01J 20/3071 (2013.01); C02F 1/285 (2013.01); C08J 5/18 (2013.01); C08J 9/26 (2013.01); C02F 2101/32 (2013.01); C02F 2103/007 (2013.01); C02F 2303/16 (2013.01); C08J 2201/0446 (2013.01); C08J 2323/12 (2013.01); C09K 3/32 (2013.01)] 18 Claims
OG exemplary drawing
 
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.