Filtration membranes and related compositions, methods and systems

Patent metadata

Field	Value
Publication number	US-9302922-B2
Application number	US-201313754883-A
Country	US
Kind code	B2
Filing date	Jan 30, 2013
Priority date	Jan 30, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

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 filtration membrane with embedded polymeric nanoparticles comprising:
hyperbranched polymeric molecules covalently cross-linked to form polymeric nanoparticles embedded in a polymer matrix formed by a porous polymeric aggregate.

2. The filtration membrane of claim 1 wherein the porous polymeric aggregate 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.

3. The filtration membrane according to claim 2 , 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.

4. The filtration membrane according to claim 1 , wherein the polymeric nanoparticles comprise covalently cross-linked dendritic polymer.

5. The filtration membrane according to claim 4 , wherein the cross-linked dendritic polymer is a polyimine.

6. The filtration membrane according to claim 5 , wherein the polyimine is poly(ethyleneimine).

7. The filtration membrane of claim 6 , wherein the poly(ethyleneimine) has a degree of branching of about 65-70%.

8. The filtration membrane according to claim 4 , wherein the cross-linked dendritic polymer is present in a concentration of greater than about 20 weight %.

9. The filtration membrane according to claim 4 , wherein the cross-linked dendritic polymer is present in a concentration of greater than about 40 weight %.

10. The filtration membrane according to claim 1 , wherein the polymeric nanoparticles further comprise cross-linked poly(methacrylic acid).

11. The filtration membrane of claim 1 , wherein the polymeric nanoparticles are homogenously distributed in the polymer matrix.

12. The filtration membrane of claim 11 , wherein the polymeric nanoparticles are in a concentration up to about 50% and/or wherein fractal formation of nanoparticle is not detectable.

Assignees

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

Inventors

• Diallo Mamadou S
• Kotte Madhusudhana Rao

Classifications

• B01D71/34

  Polyvinylidene fluoride · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title

• B01D69/141 Primary

  Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes · CPC title

• B01D71/60

  Polyamines · CPC title

• C02F1/444

  by ultrafiltration or microfiltration · CPC title