In 2019,ACS Applied Materials & Interfaces included an article by Yan, Xiaoming; Zhang, Huaqing; Hu, Zhongyue; Li, Lv; Hu, Lei; Li, Zhi’ang; Gao, Li; Dai, Yan; Jian, Xigao; He, Gaohong. Application In Synthesis of 1-Methyl-4-piperidone. The article was titled 《Amphoteric-Side-Chain-Functionalized “”Ether-Free”” Poly(arylene piperidinium) Membrane for Advanced Redox Flow Battery》. The information in the text is summarized as follows:
To solve the stability issue of cost-effective non-fluorinated membranes, a ether-free poly(arylene piperidinium) (PBPip) based membrane is 1st applied in redox flow batteries (RFBs). For improved efficiencies of RFB, amphoteric side chains are introduced onto the PBPip. Without ether bond in the polymer backbone, the membrane shows a good stability in the strong oxidation environment. The FTIR spectra exhibit no obvious changes for 30 days of oxidation test. Different from traditional blended amphoteric membranes, the amphoteric side chain allows that cation and anion exchange capacities both increase with grafting degree, which leads to a very high total IEC (4.19 mmol/g). Outstanding ion conduction ability (area resistance: 0.22 Ω cm2) comparable to Nafion 212 (0.24 Ω cm2) is consequently achieved. Ionic crosslinking structure between cationic and anionic groups results in low swelling rate (13.9%). Combining with repelling effect of pos. charged piperidinium, a low VO2+ permeability (1.31×10-8 cm2/s) is accomplished. From these good properties, the membrane exhibits excellent vanadium battery performances, especially at high current densities. The WE and EE both exceeds 80% even at 200 mA/cm2. The battery performances have no obvious reductions after 500 cycles. This work provides a new orientation to design the membrane for RFB. In the experiment, the researchers used many compounds, for example, 1-Methyl-4-piperidone(cas: 1445-73-4Application In Synthesis of 1-Methyl-4-piperidone)
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.Application In Synthesis of 1-Methyl-4-piperidone
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem