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http://cicy.repositorioinstitucional.mx/jspui/handle/1003/3164| Synthesis and gas permeation properties of ring-opened polynorbornene dicarboximides bearing 2,2,6,6-tetramethylpiperidyl moieties | |
| JOEL VARGAS ORTEGA ARLETTE ARIZBE SANTIAGO DE LA CRUZ MODESTO JAVIER CRUZ GOMEZ JORGE ARMANDO CRUZ MORALES Mikhail A. Tlenkopatchev María Isabel de los Dolores Loría Bastarrachea JOSE LUIS SANTIAGO GARCIA Manuel de Jesús Aguilar Vega | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| GAS PERMEATION POLYNORBORNENE DICARBOXIMIDE RING-OPENING METATHESIS POLYMERIZATION | |
| The N-2,2,6,6-tetramethylpiperidyl-norbornene-5,6-dicarboximide (2a), N-4-hydroxy-phenyl-norbornene-5,6-dicarboximide (2b), and N-pentafluorophenyl-norbornene-5,6-dicarboximide (2c) mixtures of exo and endo monomers were synthesized and polymerized via ring opening metathesis polymerization (ROMP) using bis(tricyclohexylphosphine) benzylidene ruthenium (IV) dichloride (I) and tricyclohexylphosphine [1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene] [benzylidene] ruthenium dichloride (II) to produce the corresponding polynorbornene dicarboximides PTMPiNDI, PHPhNDI, and PPFPhNDI, respectively. The transport of five gases He, , N 2 , O 2 , CO 2 and 4 CH across membranes prepared from these polynorbornenes were determined at 35°C by using a constant volume permeation cell. Gas permeability, diffusion, and solubility coefficients of PTMPiNDI classify it as a low permeability polymer for oxygen and carbon dioxide with possibilities of use in packaging applications. It was also found that gas permeation is lower in PTMPiNDI due to a lower fractional free volume (FFV), which difficulties the diffusion through it as compared to PHPhNDI and PPFPhNDI that present more open structures. The permeability coefficients for all gases in the fluorine-containing PPFPhNDI membrane are much more larger than those in the non-fluorinated PHPhNDI and PTMPiNDI membranes. The sorption process and not the diffusive step is responsible for this increase in the permeability of the PPFPhNDI membrane. A molecular dynamics simulation of each polynorbornene was performed to estimate the density value. The results are in good agreement with the experimentally measured densities and allow to corroborate FFV determinations. | |
| 2012 | |
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| PROPIEDADES DE LOS MATERIALES | |
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| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Artículos de Investigación Arbitrados |
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