Zhou, Xixing; Wu, Lexuan; Zhang, Guangxu; Li, Ruyu; Hu, Xu; Chang, Xuanwei; Shen, Yinghua; Liu, Lei; Li, Nanwen published their research in Journal of Membrane Science in 2021. The article was titled 《Rational design of comb-shaped poly(arylene indole piperidinium) to enhance hydroxide ion transport for H2/O2 fuel cell》.Category: piperidines The article contains the following contents:
To produce anion exchange membranes (AEMs) possessing high conductivity and chem. stability, we propose a ternary copolymerization strategy to prepare comb-shaped poly(arylene indole piperidinium) copolymers with different lengths of side chain by the design of alkyl-functionalized isatin comonomers in the acid-catalyzed Friedel-Crafts polycondensations of N-methyl-4-piperidone and p-terphenyl. These polymers have a characteristic feature of hydrophobic side chain sep. attached onto aryl-ether free backbones to induce microphase separated morphol. and stable piperidinium cation within the backbone to ensure the alk. stability. PITP-C10Q85 membrane with C10 side chain showed the highest hydroxide conductivity of 134.5 mS/cm at 80 °C due to the formed microphase separated morphol. Alk. stability testing in 1 M NaOH at 80 °C demonstrated that 80% of initial conductivity was retained for PITP-C10Q85 membrane after 1200 h of testing, owning to the chem. degradation of piperidinium cation in comb-shaped membranes via Hoffman elimination and nucleophilic substitution reaction. By assembling in alk. fuel cells, PITP-C10Q85 membrane delivered a peak power d. of 445 mW/cm2 at a c.d. of 870 mA/cm2 at 60 °C. Meanwhile, in-situ stability of PITP-C10Q85 membrane demonstrated a voltage decay rate of 3.67 mV/h over 75 h of operating at 300 mA/cm2, and post-cell anal. of the aged membrane revealed that predominant nucleophilic substitution reaction was found for the degradation of PITP-C10Q85 membrane, being different from the degradation mechanisms in the ex-situ stability tests. The above results manifested that regulating the alkyl side chains on the backbone directly is a promising strategy to achieve high performance AEMs with favorable morphol., high conductivity and alk. fuel cell performance. In the experiment, the researchers used many compounds, for example, 1-Methyl-4-piperidone(cas: 1445-73-4Category: piperidines)
1-Methyl-4-piperidone(cas: 1445-73-4) is a member of piperidine. Piperidine is a key saturated heterocyclic scaffold found in several of the top-selling small molecule pharmaceuticals and natural alkaloids, with a diverse range of biological activities. Hence, continuous efforts have been made to develop convenient methods to prepare piperidine derivatives.Category: piperidines
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem