Sulfonated co‐poly(ether imide)s with alkyne groups: Fabrication of crosslinked membranes and studies on PEM properties including MFC performance

A new diamine monomer having alkyne side‐groups (DADAF) has been successfully synthesized, and it was used to prepare a series of sulfonated co‐polyimides (DFN‐XX) when reacted with 1,4,5,8‐naphthalenetetracarboxylic dianhydride along with different mole% of 4,4′‐diaminostilbene‐2,2′‐disulfonic acid...

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Bibliographic Details
Published in:Polymer engineering and science 2020-09, Vol.60 (9), p.2097-2110
Main Authors: Kumar, Anaparthi Ganesh, Saha, Sayantani, Tiwari, Bikash Ranjan, Ghangrekar, Makarand M., Das, Anuja, Mukherjee, Rabibrata, Banerjee, Susanta
Format: Article
Language:English
Subjects:
Alkynes
Atomic force microscopy
Biochemical fuel cells
Comparative analysis
Copolymers
Crosslinking
Diamines
Dianhydrides
Electric properties
Fuel cells
Membranes
Microorganisms
Microscopy
morphology
Performance enhancement
Polyetherimides
Polyimide resins
Polyimides
Relative humidity
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Summary:A new diamine monomer having alkyne side‐groups (DADAF) has been successfully synthesized, and it was used to prepare a series of sulfonated co‐polyimides (DFN‐XX) when reacted with 1,4,5,8‐naphthalenetetracarboxylic dianhydride along with different mole% of 4,4′‐diaminostilbene‐2,2′‐disulfonic acid. The membrane was made from the copolymers by solution casting route, and one of the copolymers DFN‐70 was used to prepare crosslinked membranes by adding a different amount of 1,6‐hexanediazide during solution casting step. The morphological transformation from non‐crosslinked S‐coPI to crosslinked S‐coPI was observed by employing transmission electron microscopy, atomic force microscopy, and small‐angle X‐ray scattering analyses. Compared to the non‐crosslinked DFN‐XX membranes, crosslinked DFN‐70 copolymer membranes showed low water uptake and improved mechanical and peroxide radical stability. Also, crosslinked DFN‐70 copolymer membranes showed significantly higher proton conductivities (0.004‐0.06 S cm−1) compared to those of DFN‐70 (0.003‐0.05 S cm−1) particularly, at 80°C when the relative humidity increased from 40% to 98%. Furthermore, crosslinked DFN‐70 copolymer membranes exhibited significantly enhanced performance in a microbial fuel cell (MFC) as compared to those of non‐crosslinked DFN‐70 membrane.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25454