Exfoliation of zeolites in functionalized polymers
A method for forming zeolite nanosheets includes forming a mixture including a layered zeolite precursor and a functionalized polymer and exfoliating the layered zeolite precursor to provide the zeolite nanosheets.
1. A method for forming zeolite nanosheets, the method comprising:
forming a mixture comprising a layered zeolite precursor and a functionalized polymer; and
exfoliating the layered zeolite precursor to provide the zeolite nanosheets.
2. The method of claim 1 , further comprising swelling the layered zeolite precursor prior to forming the mixture.
3. The method of claim 2 , wherein swelling the layered zeolite precursor comprises mixing the layered zeolite precursor with a cationic surfactant.
4. The method of claim 3 , wherein the cationic surfactant comprises behentrimonium chloride, benzalkonium chloride, benzethonium chloride, benzododecinium bromide, bronidox, carbethopendecinium bromide, cetalkonium chloride, cetrimonium bromide, cetrimonium chloride, cetyltrimethyl ammonium bromide, didecyldimethylammonium chloride, dimethyldioctadecylammonium bromide, dimethyldioctadecylammonium chloride, domiphen bromide, lauryl methyl gluceth-10 hydroxypropyl dimonium chloride, octenidine dihydrochloride, olaflur, N-oleyl-1,3-propanediamine, pahutoxin, stearalkonium chloride, thonzonium bromide, or a combination thereof.
5. The method of claim 1 , wherein the layered zeolite precursor comprises MCM-22 precursor.
6. The method of claim 1 , wherein the layered zeolite precursor comprises multilamellar MFI.
7. The method of claim 1 , wherein the layered zeolite precursor comprises ITQ-1 precursor.
8. The method of claim 1 , wherein the layered zeolite precursor does not comprise aluminum.
9. The method of claim 1 , wherein the functionalized polymer comprises a hemitelic polymer, a di-end-functional polymer, a telechelic polymer, a random polymer, a block polymer, or a combination thereof.
10. The method of claim 1 , wherein the functionalized polymer comprises a telechelic polybutadiene.
11. The method of claim 10 , wherein the telechelic polybutadiene comprises hydroxyl-terminated polybutadiene.
12. The method of claim 11 , wherein the telechelic polybutadiene comprises carboxyl-terminated polybutadiene.
13. The method of claim 1 , wherein exfoliating the layered zeolite precursor comprises applying a dispersion force to the mixture.
14. The method of claim 13 , wherein the dispersion force is applied to the mixture at a temperature below 100° C.
15. The method of claim 13 , wherein applying the dispersion force comprises mixing for a period of time less than 100 minutes.
16. The method of claim 13 , wherein applying the dispersion force comprises sonication for a period of time less than 100 minutes.
17. The method of claim 1 , wherein exfoliating the layered zeolite precursor comprises mixing of the mixture.
18. The method of claim 15 , wherein the mixing is conducted for a period of time less than 5 minutes.
19. The method of claim 15 , wherein the mixture is at a temperature below 100° C. during the mixing.
20. The method of claim 1 , wherein the layered zeolite precursor is prepared with an organic structure directing agent, selected from tetrapropylammonium, 2-ethyl-1,3,4-trimethylimidazolium, trimethyladamantammonium, hexamethyleneimine, hexamethonium, tetrabutylammonium, or a combination thereof.
21. The method of claim 1 , wherein the layered zeolite precursor is prepared with hexamethyleneimine and trimethyladamantammonium hydroxide.