Sulfonated perfluorocyclobutane ion-conducting membranes
First Claim
1. A sulfonated aromatic perfluorocyclobutane polymer meeting a condition selected from:
- a) the equivalent weight of the polymer is 5000 or less; and
b) the proton conductivity of the polymer at 25°
C. is 0.01 Siemens per centimeter (S/cm) or higher.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed are sulfonated aromatic perfluorocyclobutane polymers meeting a condition selected from: a) the equivalent weight of the polymer is 5000 or less, and b) the proton conductivity of the polymer at 25° C. is 0.01 Siemens per centimeter (S/cm) or higher, and methods of making same, especially sulfonated aromatic perfluorocyclobutane polymers which comprise units according to the formula:
wherein —B— is 1,2-perfluorocyclobutylene (C4F6); each —X— is independently selected from the group consisting of: a bond, —O—, —S—, —SO—, —SO2—, —CO—, —NH—, —NR1—, and —R2—, wherein R1 is C1-C25 substituted or unsubstituted, saturated or unsaturated alkyl or aryl and R2 is C1-C25 substituted or unsubstituted, saturated or unsaturated alkylene or arylene; —Ar— is a substituted or unsubstituted C1-C30 at least divalent aromatic hydrocarbon group; n is a non-negative integer chosen independently for each of said repeating units such that the average for the polymer is greater than 0. They are particularly useful in ion conducting membranes for use in electrochemical cells.
121 Citations
27 Claims
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1. A sulfonated aromatic perfluorocyclobutane polymer meeting a condition selected from:
- a) the equivalent weight of the polymer is 5000 or less; and
b) the proton conductivity of the polymer at 25°
C. is 0.01 Siemens per centimeter (S/cm) or higher. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- a) the equivalent weight of the polymer is 5000 or less; and
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17. A process for preparing a polymer comprising the step of sulfonating a perfluorocyclobutane polymer to form a sulfonated perfluorocyclobutane polymer, wherein said sulfonated perfluorocyclobutane polymer is sufficiently sulfonated as to meet a condition selected from:
- a) the equivalent weight of the polymer is 5000 or less; and
b) the proton conductivity of the polymer at 25°
C. is 0.01 S/cm or higher. - View Dependent Claims (18, 19, 20, 21, 22, 23)
- a) the equivalent weight of the polymer is 5000 or less; and
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24. A process for preparing a sulfonated perfluorocyclobutane polymer comprising:
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A) providing a perfluorocyclobutane polymer including sulfur-containing groups; and
B) converting said sulfur-containing group into a sulfonic acid group to form a sulfonated perfluorocyclobutane polymer, wherein said sulfonated perfluorocyclobutane polymer is sufficiently sulfonated as to meet a condition selected from;
a) the equivalent weight of the polymer is 5000 or less; and
b) the proton conductivity of the polymer at 25°
C. is 0.01 S/cm or higher.- View Dependent Claims (25, 26, 27)
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Specification