Crosslinked polyphosphazene blends for gas separation membranes

Patent metadata

Field	Value
Publication number	US-12344713-B2
Application number	US-202318227072-A
Country	US
Kind code	B2
Filing date	Jul 27, 2023
Priority date	Aug 19, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The disclosed invention relates to a composition comprising a crosslinked blend of polyphosphazene polymers. The composition comprises a first polyphosphazene and a second polyphosphazene, where the first polyphosphazene and the second polyphosphazene being bound by a thiol bearing crosslinking agent. Such compositions are useful as a membrane material for the separation of gasses in a gaseous mixture.

First claim

We claim:

1. A composition comprising at least a first polyphosphazene and a second polyphosphazene,
wherein the first polyphosphazene has the formula

where R comprises 50% to 95% ethoxylate and 5% to 50% aryloxy, and
where at least a portion of R comprises a crosslinked functional group;
wherein the second polyphosphazene has the formula

where R′ are aryloxy groups, and where at least a portion of R′ comprises a crosslinked functional group; and
wherein the first polyphosphazene and the second polyphosphazene are bound by a crosslinking agent where the crosslinking agent comprised two or more thiol groups prior to undergoing crosslinking.

2. The composition of claim 1 , where a portion of R is a methoxyphenoxy.

3. The composition of claim 1 , where a portion of R is 4-methoxyphenoxy.

4. The composition of claim 1 , where the crosslinked functional group of the first polyphosphazene was an allylphenol.

5. The composition of claim 1 , where the crosslinked functional group of the first polyphosphazene was 2-allylphenoxy.

6. The composition of claim 1 , where a portion of R is 2-(2-methoxyethoxy) ethanol.

7. The composition of claim 1 where a portion of R′ is a phenoxy group.

8. The composition of claim 1 where a portion of R′ is phenoxy.

9. The composition of claim 1 where the crosslinked functional group of the second polyphosphazene was an allylphenol.

10. The composition according to claim 1 where the first polyphosphazene is present in a wt % ranging from about 75 wt % to about 99 wt % and the second polyphosphazene is present in a wt % ranging from about 1 wt % to about 25 wt %.

11. The composition according to claim 1 , where the crosslinking agent is selected from the group consisting of pentaerythritol tetrakis(3-mercaptopropionate), poly(3-mercaptopropyl methyl)siloxane, or a combination thereof.

12. The composition according to claim 1 further comprising a photo-initiating agent.

13. The composition according to claim 12 where the photo-initiating agent is a small organic peroxide.

14. The composition according to claim 13 where the photo-initiating agent is 2,2-dimethoxy-2-phenylacetophenone.

15. The composition of claim 1 where a portion of R is 2-(2-methoxyethoxy) ethanol, where a portion of R′ is phenoxy, where the crosslinking agent is selected from the group consisting of pentaerythritol tetrakis(3-mercaptopropionate), poly(3-mercaptopropyl methyl)siloxane, or a combination thereof, and where the first polyphosphazene is present in a wt % ranging from about 75 wt % to about 99 wt % and the second polyphosphazene is present in a wt % ranging from about 1 wt % to about 25 wt %.

16. The composition of claim 1 where a portion of R is a 4-methoxyphenoxy and a second portion of R is 2-(2-methoxyethoxy) ethanol, where a portion of R′ is phenoxy, where the crosslinking agent is selected from the group consisting of pentaerythritol tetrakis(3-mercaptopropionate), poly(3-mercaptopropyl methyl)siloxane, or a combination thereof and where the first polyphosphazene is present in a wt % ranging from about 75 wt % to about 99 wt % and the second polyphosphazene is present in a wt % ranging from about 1 wt % to about 25 wt %.

Assignees

• Us Energy

Inventors

• Hopkinson David
• Kusuma Victor Armanda
• Venna Surendar R
• Mcnally Joshua S
• Orme Christopher J
• Stewart Frederick F

Classifications

• C08L79/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08K5/37 Primary

  Thiols · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• B01D2256/24

  Hydrocarbons · CPC title

• C08L2312/00

  Crosslinking · CPC title