Filtration membranes and related compositions, methods and systems

Patent metadata

Field	Value
Publication number	US-10058822-B2
Application number	US-201615043489-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Jan 30, 2012
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Described herein are filtration membranes and related, compositions, methods and systems and in particular filtration membranes with polymeric micro/nanoparticles embedded in a polymer matrix formed by a porous polymeric aggregate, a bicomposite membrane including a plurality of nanofibers and/or microfibers attached to a polymer matrix formed by a porous polymeric aggregate comprising polymeric nanoparticles, and related compositions, methods, and systems.

First claim

The invention claimed is:

1. A method of making a filtration membrane with embedded dendritic nanoparticles, the method comprising:
contacting a polymeric component, a dendritic component, and a solvent to provide a blend,
contacting the blend with a cross-linking component, for a time and under a condition to cause the in situ formation of dendritic nanoparticles comprising covalently cross-linked dendritic polymer to provide a dope solution; and
casting the dope solution to provide a filtration membrane with embedded dendritic nanoparticles.

2. The method of claim 1 , wherein contacting a polymeric component, a dendritic component, and a solvent to provide a blend is performed by mixing the polymeric component and dendritic component in the solvent to obtain concentration of the dendritic component in the blend between about 3.5 wt % and 7.5 wt % of the blend.

3. The method of claim 1 , wherein contacting the blend with a cross-linking component is performed by mixing the cross-linking component with the blend to obtain a concentration of the dendritic component at a concentration of about 1.5 times the concentration of the cross-linking component.

4. The method of claim 1 , wherein the polymeric component is formed by a polymer according to Formula I:

wherein:
Q, Y, and Z comprise saturated aliphatic hydrocarbon, aromatic hydrocarbon, or unsaturated aliphatic hydrocarbons;
m, l, and k independently are integers ranging between 0-50;
at least one of m, l, or k is not equal to zero;
j is an integer ranging between 50-500; and

wherein at least one of Q (when Q≠0), Y (when Y≠0), or Z (when Z≠0), comprises a polymer component functional group.

5. The method of claim 4 , wherein Q, Y, and Z are independently selected from the group consisting of Formulas II-X

wherein:
n=0 or 1;
m is an integer ranging from 0-15; and
X is a functional group comprising an atom selected from O, S, N, P, or F; and R 1 -R 18 are independently selected from: the polymer component functional group; hydrogen; C 1 -C 20 linear, branched, saturated, unsaturated, or aryl hydrocarbon which are either substituted or unsubstituted with O, N, B, S, P; or substituted O, N, B, S, or P.

6. The method of claim 1 , wherein the dendritic component is formed by a polymer according to Formula XI:

wherein:
n and m are integers ranging from 2-5;
R 1 -R 8 are independently selected from hydrogen or hyperbranched polymer moieties;
X 1 and X 2 are N; and
X 4 -X 5 are selected from amine, amide, imide, and carbamate.

7. The method of claim 1 , wherein the cross-linking component is formed a compound of Formula (XVI) or (XVII) below:

wherein X 1 and X 2 , by way of example, can be independently selected from (COCl, COBr, COI, Cl, Br, I, OSO 3 CH 3 , OSO 3 C 7 H 7 , n can range from 1-15, and wherein R can be H, alkyl, or epoxy substituted alkyl.

8. The method of claim 1 , wherein the covalently cross-linked dendritic polymer is a polyimine.

9. The method of claim 8 , wherein the polyimine is poly(ethyleneimine).

10. The method of claim 1 , wherein the dendritic nanoparticles are present in a concentration greater than about 20 weight %.

11. The method of claim 10 , wherein the dendritic nanoparticles are present in a concentration greater than about 40 weight %.

12. The method of claim 1 , wherein contacting a polymeric component, a dendritic component, and a solvent to provide a blend is performed by mixing the polymeric component and dendritic component in the solvent for about 1-24 hours at about 25-85° C.

13. The method of claim 1 , wherein contacting the blend with a cross-linking component is performed by mixing the cross-linking component with the blend for about 1-24 hours at about 25-85° C.

14. The method of claim 1 , wherein casting the dope solution to provide a filtration membrane with embedded dendritic nanoparticles is performed by phase inversion casting.

Assignees

• California Inst Of Techn
• Korea Advanced Inst Sci & Tech

Inventors

• Diallo Mamadou S
• Kotte Madhusudhana Rao

Classifications

• B01D2323/36

  Introduction of specific chemical groups · CPC title

• B01D71/60

  Polyamines · CPC title

• B01D67/0013

  Casting processes · CPC title

• B01D2323/39

  Electrospinning · CPC title

• B01D69/148

  Organic/inorganic mixed matrix membranes · CPC title