145.6299 | Heterocyclic Building Blocks-piperidine

Wang, Xin et al. published their research in Journal of Membrane Science in 2019 | CAS: 550378-30-8

4-Ethynylpiperidine hydrochloride (cas: 550378-30-8) belongs to piperidine derivatives.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. Some chemotherapeutic agents have piperidine moiety within their structure, foremost among them, vinblastine and raloxifene.Name: 4-Ethynylpiperidine hydrochloride

N-cyclic quaternary ammonium-functionalized anion exchange membrane with improved alkaline stability enabled by aryl-ether free polymer backbones for alkaline fuel cells was written by Wang, Xin;Sheng, Weibing;Shen, Yinghua;Liu, Lei;Dai, Sheng;Li, Nanwen. And the article was included in Journal of Membrane Science in 2019.Name: 4-Ethynylpiperidine hydrochloride This article mentions the following:

To realize highly stable anion exchange membrane for alk. fuel cells, aryl-ether free polystyrene (PS) was employed as polymer backbone and functionalized with alk. stable N-cyclic quaternary ammonium (QA), e.g. six-membered (DMP) and bis-six-membered N-cyclic QA (ASU) cations via “click chem.”. Surprisingly, aryl-ether free PS backbone having ASU cation displayed excellent chem. resistance in 1 M NaOH CD₃OD/D₂O solution at 80掳C even for 3000 h without obvious degradation, as confirmed by NMR spectroscopy. After blending with poly(styrene-ethylene-co-butylene-styrene) (SEBS) copolymer which improved the film-forming ability due to the poor mech. properties of PS, the ASU-based blended membrane (SEBS/PS-ASU) having SEBS polymer of 10 wt% possessed the hydroxide conductivity of 31.6 mS/cm with an ion exchange capacity (IEC) of 1.76 meq./g. This value was higher than the blended membrane having DMP cations (25.8 mS/cm with a IEC of 1.92 meq./g). Similar behavior has been observed for the PPO system having the same functional cations. It was believed that the high water uptake of ASU-based membrane resulted in the higher ion conductivity Remarkably, 92.4% of initial hydroxide conductivity was retained for SEBS/PS-ASU membrane with aryl-ether free PS backbone after storage in 1 M NaOH at 80掳C for 900 h, indicating the higher alk. stability over the AEM counterpart with aromatic PPO polymer backbones having aryl ether bonds (21.0% retention in conductivity under the same test conditions). And the accelerated stability test in 5 M NaOH at 80掳C demonstrated that only 16.8% of loss in conductivity was observed after 1800 h of testing for the blend AEMs having ASU cations. Furthermore, as ionomers in catalyst layers, the ASU-functionalized PS copolymers showed a peak power d. of 130 mW/cm² at a c.d. of 210 mA/cm². In the experiment, the researchers used many compounds, for example, 4-Ethynylpiperidine hydrochloride (cas: 550378-30-8Name: 4-Ethynylpiperidine hydrochloride).

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Wang, Xin et al. published their research in Journal of Membrane Science in 2019 | CAS: 550378-30-8

To realize highly stable anion exchange membrane for alk. fuel cells, aryl-ether free polystyrene (PS) was employed as polymer backbone and functionalized with alk. stable N-cyclic quaternary ammonium (QA), e.g. six-membered (DMP) and bis-six-membered N-cyclic QA (ASU) cations via “click chem.”. Surprisingly, aryl-ether free PS backbone having ASU cation displayed excellent chem. resistance in 1 M NaOH CD₃OD/D₂O solution at 80°C even for 3000 h without obvious degradation, as confirmed by NMR spectroscopy. After blending with poly(styrene-ethylene-co-butylene-styrene) (SEBS) copolymer which improved the film-forming ability due to the poor mech. properties of PS, the ASU-based blended membrane (SEBS/PS-ASU) having SEBS polymer of 10 wt% possessed the hydroxide conductivity of 31.6 mS/cm with an ion exchange capacity (IEC) of 1.76 meq./g. This value was higher than the blended membrane having DMP cations (25.8 mS/cm with a IEC of 1.92 meq./g). Similar behavior has been observed for the PPO system having the same functional cations. It was believed that the high water uptake of ASU-based membrane resulted in the higher ion conductivity Remarkably, 92.4% of initial hydroxide conductivity was retained for SEBS/PS-ASU membrane with aryl-ether free PS backbone after storage in 1 M NaOH at 80°C for 900 h, indicating the higher alk. stability over the AEM counterpart with aromatic PPO polymer backbones having aryl ether bonds (21.0% retention in conductivity under the same test conditions). And the accelerated stability test in 5 M NaOH at 80°C demonstrated that only 16.8% of loss in conductivity was observed after 1800 h of testing for the blend AEMs having ASU cations. Furthermore, as ionomers in catalyst layers, the ASU-functionalized PS copolymers showed a peak power d. of 130 mW/cm² at a c.d. of 210 mA/cm². In the experiment, the researchers used many compounds, for example, 4-Ethynylpiperidine hydrochloride (cas: 550378-30-8Name: 4-Ethynylpiperidine hydrochloride).

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Wang, Xin et al. published their research in Journal of Membrane Science in 2019 | CAS: 550378-30-8

To realize highly stable anion exchange membrane for alk. fuel cells, aryl-ether free polystyrene (PS) was employed as polymer backbone and functionalized with alk. stable N-cyclic quaternary ammonium (QA), e.g. six-membered (DMP) and bis-six-membered N-cyclic QA (ASU) cations via “click chem.”. Surprisingly, aryl-ether free PS backbone having ASU cation displayed excellent chem. resistance in 1 M NaOH CD₃OD/D₂O solution at 80°C even for 3000 h without obvious degradation, as confirmed by NMR spectroscopy. After blending with poly(styrene-ethylene-co-butylene-styrene) (SEBS) copolymer which improved the film-forming ability due to the poor mech. properties of PS, the ASU-based blended membrane (SEBS/PS-ASU) having SEBS polymer of 10 wt% possessed the hydroxide conductivity of 31.6 mS/cm with an ion exchange capacity (IEC) of 1.76 meq./g. This value was higher than the blended membrane having DMP cations (25.8 mS/cm with a IEC of 1.92 meq./g). Similar behavior has been observed for the PPO system having the same functional cations. It was believed that the high water uptake of ASU-based membrane resulted in the higher ion conductivity Remarkably, 92.4% of initial hydroxide conductivity was retained for SEBS/PS-ASU membrane with aryl-ether free PS backbone after storage in 1 M NaOH at 80°C for 900 h, indicating the higher alk. stability over the AEM counterpart with aromatic PPO polymer backbones having aryl ether bonds (21.0% retention in conductivity under the same test conditions). And the accelerated stability test in 5 M NaOH at 80°C demonstrated that only 16.8% of loss in conductivity was observed after 1800 h of testing for the blend AEMs having ASU cations. Furthermore, as ionomers in catalyst layers, the ASU-functionalized PS copolymers showed a peak power d. of 130 mW/cm² at a c.d. of 210 mA/cm². In the experiment, the researchers used many compounds, for example, 4-Ethynylpiperidine hydrochloride (cas: 550378-30-8Name: 4-Ethynylpiperidine hydrochloride).

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem