Novel sulfonated polyimides containing multiple cyano groups for polymer electrolyte membranes

Some multiple cyano groups functionalized sulfonated polyimides (CN-SPIs) are prepared derived from a novel CN-diamine monomer for the first time. Meanwhile, some similar SPIs but without cyano groups (Ph-SPIs) are prepared as counterparts for comparison purposes. Both chemical structure and propert...

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Bibliographic Details
Published in:Journal of power sources 2013-09, Vol.238, p.236-244
Main Authors: Song, Yang, Jin, Yinhua, Liang, Qiuju, Li, Kechang, Zhang, Yunhe, Hu, Wei, Jiang, Zhenhua, Liu, Baijun
Format: Article
Language:English
Subjects:
Applied sciences
Conductivity
Cyano groups
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrolytes
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Membranes
Methyl alcohol
Monomers
Polyimide resins
Polyimides
Polymer electrolyte membranes
Swelling
Synthesis
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Summary:Some multiple cyano groups functionalized sulfonated polyimides (CN-SPIs) are prepared derived from a novel CN-diamine monomer for the first time. Meanwhile, some similar SPIs but without cyano groups (Ph-SPIs) are prepared as counterparts for comparison purposes. Both chemical structure and properties of these SPIs are carefully characterized. At 100 °C, proton conductivities of some membranes could reach 0.138–0.146 S cm−1, which are comparative with Nafion. The methanol diffusion coefficients of the membranes are between 1.74 and 5.82 × 10-7 cm2 s−1, which are much more competitive than Nafion 117. It is of interest to find that cyano-functionalized SPIs could possess an excellent combination of low swelling, high proton conductivity and low methanol permeability. [Display omitted] •Novel multiple cyano-groups containing polyimides were prepared for PEM applications.•The properties of the PEMs were carefully characterized.•The cyano-functionalized SPIs exhibited some attractive properties.•The CN-SPI membranes exhibited high proton conductivity and low swelling at 100 °C.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.03.088