Composite membranes and applications thereof

Patent metadata

Field	Value
Publication number	US-10894235-B2
Application number	US-201816118164-A
Country	US
Kind code	B2
Filing date	Aug 30, 2018
Priority date	Aug 31, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

In one aspect, a composite membrane comprises a polymeric host comprising polybenzimidazole or polybenzimidazole derivative and graphene oxide dispersed in the polymeric host, the graphene oxide at least partially functionalized with phosphonic acid moieties, phosphonate moieties or combinations thereof. In some embodiments, the functionalized graphene oxide is homogeneously dispersed in the polymeric host and/or is not agglomerated in the polymeric host.

First claim

The invention claimed is:

1. A composite membrane comprising:
a polymeric host comprising polybenzimidazole or polybenzimidazole derivative; and
graphene oxide dispersed in the polymeric host, wherein the graphene oxide is at least partially functionalized with phosphonic acid moieties, phosphonate moieties or combinations thereof.

2. The composite membrane of claim 1 , wherein the functionalized graphene oxide is homogeneously dispersed in the polymeric host.

3. The composite membrane of claim 1 , wherein the functionalized graphene oxide is not agglomerated in the polymeric host.

4. The composite membrane of claim 1 , wherein the phosphonic acid moieties and/or phosphonate moieties are coupled to the graphene oxide via amide linkages.

5. The composite membrane of claim 1 , wherein the functionalized graphene oxide is present in an amount of 0.1-1 weight percent of the composite membrane.

6. The composite membrane of claim 5 having Young's modulus of 2.5-5 GPa.

7. The composite membrane of claim 5 having tensile strength of 85-120 MPa.

8. A method of making the composite membrane of claim 1 comprising:
providing a polymeric host comprising polybenzimidazole or polybenzimidazole derivative;
functionalizing graphene oxide with phosphoric acid moieties, phosphonate moieties or combinations thereof; and
blending the functionalized graphene oxide with the polymeric host.

9. The method of claim 8 , wherein the functionalized graphene oxide is dispersed in the polymeric host.

10. The method of claim 8 , wherein the functionalized graphene oxide is not agglomerated in the polymeric host.

11. The method of claim 8 , wherein the phosphonic acid moieties and/or phosphonate moieties are coupled to the graphene oxide via amide linkages.

12. The method of claim 8 , wherein the functionalized graphene oxide is present in an amount of 0.1-1 weight percent of the composite membrane.

13. The method of claim 8 , wherein the composite membrane has Young's modulus of 2.5-5 GPa.

14. The methods of claim 8 , wherein the composite membrane has tensile strength of 85-120 MPa.

15. The composite membrane of claim 1 , wherein the polymeric host comprises (poly(2,20-m-(phenylene)-5,50-bibenzimidazole).

Assignees

• Univ Arkansas

Inventors

• Tian Zheng R
• Turgut Hulusi

Classifications

• B01D67/00793

  Dispersing a component, e.g. as particles or powder, in another component · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• B01D71/0211

  Graphene or derivates thereof · CPC title

• H01M8/0293

  Matrices for immobilising electrolyte solutions · CPC title

• H01M8/1051

  Non-ion-conducting additives, e.g. stabilisers, SiO2 or ZrO2 · CPC title