Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 490, Issue -, Pages 346-353Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2015.05.005
Keywords
Polybenzothiazoles; Proton exchange membrane; Sulfonated polymer
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Funding
- Nano Material Technology Development Program through the National Research Foundation of Korea [2012M3A7B4049745]
- National Natural Science Foundation of China [51403054]
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Two series of sulfonated polybenzothiazoles containing naphthalene, derived from either 2,2-bis(4-carboxyphenyl) hexafluoropropane (6FA) or 2,6 naphthalene dicarboxylic acid (NA) were synthesized by polycondensation with non-sulfonated monomer 2,5-diamino-1,4-benzenedithiol dihydrochloride (DABDT) and sulfonated monomer 4,8-disulfonyl-2,6-naphthalene dicarboxylic acid (DSNA). The sPBT-6FA series polymers containing DSNA were soluble in polar aprotic solvents such as dimethyl sulfoxide or 1-methyl-2-pyrrolidinone, whereas sPBT-NA65 with NA was not soluble in common polar aprotic solvents. Therefore, the incorporation of both the naphthalene and flexible hexafluoroisopropylidene units enhanced the solubility of the sPBT polymer series. The polymers were evaluated as proton exchange membranes and exhibited excellent dimensional stability, high thermal and oxidative stabilities, good mechanical properties, and high proton conductivities. The proton conductivities of sPBT-6FA65 were 025 S cm(-1) at 80 degrees C in water and 0.018 S cm(-1) at 120 degrees C under 35% RH. (C) 2015 Elsevier B.V. All rights reserved.
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