Gradient reinforced proton exchange membrane
View Patent ↗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.
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.