Sulfonated poly(ether imide)s with fluorenyl and trifluoromethyl groups: Application in microbial fuel cell (MFC)

• Published in: European polymer journal 2016-10, Vol.83, p.114-128
• Main Authors: Ganesh Kumar, Anaparthi, Bera, Debaditya, Banerjee, Susanta, Veerubhotla, Ramya, Das, Debabrata
• Format: Article
• Language: English
• Subjects: Biochemical fuel cells; Copolymers; Diamines; Dianhydrides; Fluorenyl moiety; Microbial fuel cell performance; Monomers; Peroxides; Polycondensation reactions; Proton exchange membranes; Solvents; Sulfonated co-poly(ether imide)s
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/j.eurpolymj.2016.08.009

[Display omitted] •Fluorenyl moiety containing sulfonated co-polymers were synthesized.•The co-polymers showed high peroxide radical resistance and hydrolytic stability.•Nano-phase separated morphology for all the co-polymers were observed.•The copolymers showed proton conductivity up to 149mScm−1.•The copolymers showed good microbial fuel cell performance. A series of fluorenyl and trifluoromethyl groups containing co-poly(ether imide)s (S-co-PIs) have been prepared from a new diamine monomer; 9,9-bis(3-methoxy-4-(4-amino(3-trifluoro-methyl)biphenoxy)phenyl)-9H-fluorene (APHPF). The polymers were prepared by the polycondensation reaction of 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) with two different diamines; APHPF and 4,4′-diaminostilbene-2,2′-disulfonicacid (DSDSA) as a co-monomer. The monomer and polymers were well characterized by 1H NMR and ATR-FTIR spectroscopies. The co-polymers were soluble in various organic solvents and membranes were prepared from solution cast route. The S-co-PIs showed high thermal and mechanical stability. TEM and AFM results supports the formation of phase separated morphology with well separated ionic-clusters. All these S-co-PIs displayed reasonably high proton conductivity. One of the copolymers (DAN-80; IECw ∼2.27meqg−1) exhibited a proton conductivity as high as 149mScm−1 which was comparable to that of Nafion® 117 (165mScm−1) at 80°C. The co-polymers maintain a good balance between water-uptake and swelling ratios and peroxide resistance. Microbial Fuel Cell (MFC) performance of the co-polymers were evaluated DAN-80 exhibited a similar performance like Nafion® 117 under similar test condition.