IP Library Granted Patent US 8,003,732
Granted Patent B2
US 8,003,732 · App. 12/197,874 · Granted Aug 23, 2011

Gradient reinforced proton exchange membrane

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Quick Facts
Patent No.
US 8,003,732
App. No.
12/197,874
Granted
Aug 23, 2011
Kind
B2
Abstract

An ion conducting polymeric structure suitable for fuel cell applications is provided. The polymeric structure comprises a non-homogenous polymeric layer. The non-homogeneous layer is a blend of a first polymer comprising cyclobutyl moiety; and a second polymer having a non-ionic polymer segment. The weight ratio of the first polymer to the second polymer varies as a function of position within the non-homogenous layer. The blend composition may be cast into an electrolyte membrane that can be used to prepare electrochemical cells such as batteries and fuel cells.

Claims (95)

1. A polymeric structure comprising:

a non-homogenous polymeric layer including:

a first polymer comprising cyclobutyl moiety; and

a second polymer having a non-ionic polymer segment, wherein the weight ratio of first polymer to the second polymer varies as a function of position within the non-homogenous layer.

2. The polymeric structure of claim 1 wherein the non-homogeneous polymeric layer has a sheet-like spatial configuration with a first and second spatial dimension that is greater than a third spatial dimension.

3. The polymeric structure of claim 2 wherein the weight ratio of first polymer to the second polymer varies as a function of the first and second spatial dimension.

4. The polymeric structure of claim 2 wherein the weight ratio of first polymer to the second polymer varies as a function of the third spatial dimension.

5. The polymeric structure of claim 1 wherein the first polymer includes one or more functional groups selected from the group consisting of —SO 3 H, COOH, PO 3 H 2 , and combinations thereof.

6. The polymeric structure of claim 1 wherein the first polymer comprises polymer segments 1 and 2:

[E 1 (Z 1 ) d ]—P 1 -Q 1 -P 2   1

E 2 -P 3 -Q 2 -P 4   2

wherein:

Z 1 is a protogenic group;

E 1 is an aromatic containing moiety;

E 2 is an unsulfonated aromatic-containing and/or aliphatic-containing moiety;

X is an —OH, a halogen, an ester, or

d is the number of Z 1 attached to E 1 ;

P 1 , P 2 , P 3 , P 4 are each independently: absent, —O—, —S—, —SO—, —CO—, —SO 2 —, —NR 1 H—, NR 2 —, or —R 3 —, and

R 2 is C 1-25 alkyl, C 1-25 aryl or C 1-25 arylene;

R 3 is C 1-25 alkylene, C 1-25 perfluoroalkylene, perfluoroalkyl ether, alkylether, or C 1-25 arylene;

R 4 is trifluoromethyl, C 1-25 alkyl, C 1-25 perfluoroalkylene, C 1-25 aryl, or another E 1 group; and

Q 1 , Q 2 are each independently a fluorinated cyclobutyl moiety.

7. The polymeric structure of claim 1 wherein the first polymer includes polymer segments 3 and 4:

wherein:

Z 1 is a protogenic group;

E 1 , E 2 are each independently an aromatic-containing and/or aliphatic-containing moiety;

X is an —OH, a halogen, an ester, or

d is the number of Z 1 attached to E 1 ;

P 1 , P 2 , P 3 , P 4 are each independently: absent, —O—, —S—, —SO—, —CO—, —SO 2 —, —NH—, NR 2 —, or —R 3 —, and

R 2 is C 1-25 alkyl, C 1-25 aryl or C 1-25 arylene;

R 3 is C 1-25 alkylene, C 1-25 perfluoroalkylene, perfluoroalkyl ether, alkylether, or C 1-25 arylene;

R 4 is trifluoromethyl, C 1-25 alkyl, C 1-25 perfluoroalkylene, C 1-25 aryl, or another E 1 group;

R 8 (Z 1 ) d is a moiety having d number of protogenic groups; and

Q 1 , Q 2 are each independently a fluorinated cyclobutyl moiety.

8. The polymeric structure of claim 2 wherein the first polymer comprises polymer segments 5 and 6:

E 1 (Z 1 ) d —P 1 -Q 1 -P 2   5

E 2 -P 3 -Q 2 -P 4   6

connected by a linking group L 1 to form polymer units 7 and 8:

E 2 -P 3 -Q 2 -P 4 j L 1 E 1 (Z 1 ) d —P 1 -Q 1 -P 2 i   7

E 1 (Z 1 ) d —P 3 -Q 2 -P 4 i L 1 E 2 -P 1 -Q 1 -P 2 j   8

wherein:

Z 1 is a protogenic group;

E 1 is an aromatic-containing moiety;

E 2 is an unsulfonated aromatic-containing and/or aliphatic-containing moiety;

L 1 is a linking group;

X is an —OH, a halogen, an ester, or

d is a number of Z 1 functional groups attached to E 1 ;

P 1 , P 2 , P 3 , P 4 are each independently absent, —O—, —S—, —SO—, —SO 2 —, —CO—, —NH—, NR 2 —, —R 3 —, and

R 2 is C 1-25 alkyl, C 1-25 aryl or C 1-25 arylene;

R 3 is C 1-25 alkylene, C 1-25 perfluoroalkylene, or C 1-25 arylene;

R 4 is trifluoromethyl, C 1-25 alkyl, C 1-25 perfluoroalkylene, C 1-25 aryl, or another E 1 group;

Q 1 , Q 2 are each independently a fluorinated cyclobutyl moiety;

i is a number representing the repetition of polymer segment 5; and

j is a number representing the repetition of a polymer segment 6.

9. The polymeric structure of claim 2 wherein the first polymer includes polymer segments 9 and 10:

E 1 (Z 1 ) d —P 1 -Q 1 -P 2   9

E 2 (Z 1 ) f —P 3   10

wherein:

Z 1 is a protogenic group;

E 1 , E 2 are each independently an aromatic or aliphatic-containing moiety wherein at least one of E 1 and E 2 include an aromatic substituted with Z 1 ;

X is an —OH, a halogen, an ester, or

d is the number of (SO 2 X) functional groups attached to E 1 ;

f is the number of (SO 2 X) functional groups attached to E 2 ;

P 1 , P 2 , P 3 are each independently absent, —O—, —S—, —SO—, —SO 2 —, —CO—, —NH—, NR 2 —, —R 3 —, and

R 2 is C 1-25 alkyl, C 1-25 aryl or C 1-25 arylene;

R 3 is C 1-25 alkylene, C 1-25 perfluoroalkylene, perfluoroalkyl ether, alkyl ether, or C 1-25 arylene;

R 4 is trifluoromethyl, C 1-25 alkyl, C 1-25 perfluoroalkylene, C 1-25 aryl, or another E 1 group; and

Q 1 is a fluorinated cyclobutyl moiety,

with the proviso that when d is greater than zero, f is zero and when f is greater than zero d is zero.

10. The polymeric structure of claim 1 wherein the second polymer is a fluoroelastomer.

11. The polymeric structure of claim 10 wherein the fluoroelastomer is selected from the group consisting of poly(tetrafluoroethlyene-co-ethylene), poly(vinylidene fluoride-co-hexafluoropropylene), poly(tetrafluoroethylene-co-propylene), terpolymer of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene, and terpolymer of ethylene, tetrafluoroethylene and perfluoromethylvinylether.

12. The polymeric structure of claim 1 wherein the second polymer comprises a copolymer of vinylidene fluoride and hexafluoropropylene.

13. A polymeric structure comprising:

a porous structure; and

a non-homogenous polymeric layer including:

a first polymer comprising cyclobutyl moiety; and

a second polymer having a non-ionic polymer segment, the non-homogenous polymeric layer being intermingled with the porous structure, wherein the weight ratio of first polymer to the second polymer varies as a function of position within the non-homogenous layer.

14. The polymer structure of claim 13 further comprises at least one additional polymer layer.

15. The polymer structure of claim 13 wherein the porous structure is a porous polymer layer.

16. The polymeric structure of claim 13 wherein the non-homogeneous polymeric layer has a sheet-like spatial configuration with a first and second spatial dimension that is greater than a third spatial dimension.

17. The polymeric structure of claim 16 wherein the weight ratio of first polymer to the second polymer varies as a function of the first and second spatial dimension.

18. The polymeric structure of claim 16 wherein the weight ratio of first polymer to the second polymer varies as a function of the third spatial dimension.

19. A polymeric structure comprising:

a first non-homogenous polymeric layer including:

a first polymer comprising cyclobutyl moiety; and

a second polymer having a non-ionic polymer segment, wherein the weight ratio of first polymer to the second polymer varies as a function of position within the first non-homogenous layer; and

a second non-homogenous polymeric layer disposed over the first non-homogenous polymeric layer, the second non-homogenous polymeric layer including:

a third polymer comprising cyclobutyl moiety; and

a fourth polymer having a non-ionic polymer segment, wherein the weight ratio of third polymer to the fourth polymer varies as a function of position within the second non-homogenous layer.

20. A polymeric structure comprising:

a first polymeric layer;

a second polymeric layer disposed over the first polymeric layer, the second polymeric layer including:

a first polymer comprising cyclobutyl moiety; and

a second polymer having a non-ionic polymer segment, wherein the weight ratio of first polymer to the second polymer varies as a function of position within the second polymeric layer; and

a third polymeric layer disposed over the second polymeric layer.

Assignments (12)
RELEASE OF SECURITY INTEREST Recorded Nov 7, 2014
From: WILMINGTON TRUST COMPANY
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 034384/0758 →
CHANGE OF NAME Recorded Feb 10, 2011
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 025781/0211 →
SECURITY AGREEMENT Recorded Nov 8, 2010
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: WILMINGTON TRUST COMPANY
Reel/Frame 025324/0475 →
RELEASE OF SECURITY INTEREST Recorded Nov 5, 2010
From: UAW RETIREE MEDICAL BENEFITS TRUST
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025315/0046 →
RELEASE OF SECURITY INTEREST Recorded Nov 4, 2010
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025245/0909 →
SECURITY AGREEMENT Recorded Aug 28, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UAW RETIREE MEDICAL BENEFITS TRUST
Reel/Frame 023162/0237 →
SECURITY AGREEMENT Recorded Aug 27, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 023156/0313 →
RELEASE OF SECURITY INTEREST Recorded Aug 21, 2009
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023126/0914 →
RELEASE OF SECURITY INTEREST Recorded Aug 21, 2009
From: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023155/0769 →
SECURITY AGREEMENT Recorded Apr 16, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
Reel/Frame 022554/0538 →
SECURITY AGREEMENT Recorded Feb 4, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 022201/0448 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 2, 2008
From: MACKINNON, SEAN M.; SCHOENEWEISS, MICHAEL R.; FULLER, TIMOTHY J.; GITTLEMAN, CRAIG S.
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 021910/0406 →