New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity
摘要:
This paper discusses a new class of high performance polyethylene-based anion exchange membranes (PE-AEMs) that contain a wide concentration range of pendant (flexible) ammonium chloride (NR(3)(+)Cl(-)) groups and with or without a cross-linked PE matrix structure. The chemistry involves a metallocene-mediated polymerization of ethylene, silane-protected alpha,omega-aminoolefin [C(x)N(SiMe(3))(2)], with or without styrenic diene (crosslinker), to form ethylene/C(x)N(SiMe(3))(2) copolymers and ethylene/C,N(SiMe(3))(2)/diene terpolymers, respectively. The resulting co- and ter-polymers were completely soluble in common organic solvents and were solution-casted into uniform films (thickness, 50-70 mu m; without backing material) and then thermal cross-linked in ethylene/C(x)N(SiMe(3))(2)/diene case, further interconverting the silane-protected amino groups into the desired -NR(3)(+)Cl(-) groups (R: H, CH(3), and C(3)H(7)) under solid state conditions. The resulting PE-NR(3)(+)Cl(-) and cross-linked x-PE-N(CH(3))(3)(+)Cl(-) membranes were systematically studied to understand how the PE structure (-NR(3)(+)Cl(-) concentration, R group, cross-linking density, ete.) affects ionic conductivity, water uptake, film stability, and ion selectivity. For comparison, several commercially available AEMs were also examined. Evidently, an x-PE-N(CH(3))(3)(+)Cl(-) membrane, with 28.1 mol % -N(CH(3))(3)(+)Cl(-) groups and 0.2 mol 96 cross-linkers, shows moderate water swelling and outperforms all commercial membranes with exceptionally high ionic conductivities of 119.6 mS/cm in 2 N HCl solution and 78.8 mS/cm in 2 N HCl-0.2N CuCl solution at room temperature.
A new synthesis of N,N-bis(trimethylsilyl)enamines from straight chain olefinic amines has been devised which makes use of iron pentacarbonyl photocatalysed isomerisation. Complete conversion of the olefinic amines to the enamines was observed for substituted N,N-bis(trimethylsilyl)allylamines and non-allylic amines. The enamines obtained are potential sources of aldehydes and precursors of substituted
A new family of poly(4-methyl-1-pentene) ionomers with high energy density at a high breakdown strength, high charge-discharge energy efficiency and a very narrow breakdown distribution for energy storage in future capacitor devices.
CORRIU, R. J. P.;HUYNH, V.;MOREAU, J. J. E.;PATAUD-SAT, M., J. ORGANOMET. CHEM., 1983, 255, N 3, 359-364
作者:CORRIU, R. J. P.、HUYNH, V.、MOREAU, J. J. E.、PATAUD-SAT, M.
DOI:——
日期:——
Kabalka, George W.; Wang, Zhe, Synthetic Communications, 1990, vol. 20, # 14, p. 2113 - 2118
作者:Kabalka, George W.、Wang, Zhe
DOI:——
日期:——
New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity
作者:Min Zhang、Hyung Kyu Kim、Elena Chalkova、Fedkin Mark、Serguei N. Lvov、T. C. Mike Chung
DOI:10.1021/ma200836d
日期:2011.8.9
This paper discusses a new class of high performance polyethylene-based anion exchange membranes (PE-AEMs) that contain a wide concentration range of pendant (flexible) ammonium chloride (NR(3)(+)Cl(-)) groups and with or without a cross-linked PE matrix structure. The chemistry involves a metallocene-mediated polymerization of ethylene, silane-protected alpha,omega-aminoolefin [C(x)N(SiMe(3))(2)], with or without styrenic diene (crosslinker), to form ethylene/C(x)N(SiMe(3))(2) copolymers and ethylene/C,N(SiMe(3))(2)/diene terpolymers, respectively. The resulting co- and ter-polymers were completely soluble in common organic solvents and were solution-casted into uniform films (thickness, 50-70 mu m; without backing material) and then thermal cross-linked in ethylene/C(x)N(SiMe(3))(2)/diene case, further interconverting the silane-protected amino groups into the desired -NR(3)(+)Cl(-) groups (R: H, CH(3), and C(3)H(7)) under solid state conditions. The resulting PE-NR(3)(+)Cl(-) and cross-linked x-PE-N(CH(3))(3)(+)Cl(-) membranes were systematically studied to understand how the PE structure (-NR(3)(+)Cl(-) concentration, R group, cross-linking density, ete.) affects ionic conductivity, water uptake, film stability, and ion selectivity. For comparison, several commercially available AEMs were also examined. Evidently, an x-PE-N(CH(3))(3)(+)Cl(-) membrane, with 28.1 mol % -N(CH(3))(3)(+)Cl(-) groups and 0.2 mol 96 cross-linkers, shows moderate water swelling and outperforms all commercial membranes with exceptionally high ionic conductivities of 119.6 mS/cm in 2 N HCl solution and 78.8 mS/cm in 2 N HCl-0.2N CuCl solution at room temperature.