US 11,938,658 B1
Multi-functional freestanding thin films produced using plastic waste and methods thereof
Junaid Saleem, Al-Ahsa (SA); Safdar Hossain Sk, Al-Ahsa (SA); Zubair Khalid Baig Moghal, Al-Ahsa (SA); and Gordon McKay, Al-Ahsa (SA)
Assigned to KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed by KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed on Mar. 8, 2023, as Appl. No. 18/119,235.
Int. Cl. B29C 49/00 (2006.01); B29C 41/00 (2006.01); B29C 41/08 (2006.01); B29K 105/04 (2006.01); B29K 105/26 (2006.01)
CPC B29C 41/085 (2013.01) [B29C 41/003 (2013.01); B29K 2105/041 (2013.01); B29K 2105/26 (2013.01)] 9 Claims
 
1. A method of making a freestanding thin film with micropores, the method comprising:
mixing a polymer material selected from the group consisting of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), and any mixture or combination thereof in an organic solvent to form a solution;
stirring the solution to obtain a stirred solution;
pouring the stirred solution on a solid substrate to form a first coated solid substrate;
spin coating the first coated solid substrate until the solvent is removed from a surface of the solid substrate to obtain a second coated solid substrate;
collecting an excess polymer material and an excess solvent from a drain following the spin coating step; and
removing a polymer thin film from the second coated solid substrate to obtain the freestanding thin film with micropores;
wherein the spin coating is conducted for about 1 to about 15 minutes at an rpm of about 100 to about 6000.