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http://cicy.repositorioinstitucional.mx/jspui/handle/1003/891| Gas permeability and selectivity of hexafluoroisopropylidene aromatic isophthalic copolyamides | |
| CRISTIAN CARRERA FIGUEIRAS MANUEL DE JESUS AGUILAR VEGA | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| AROMATIC POLYAMIDES GAS PERMEATION GAS TRANSPORT PROPERTIES ISOPHTHALIC ARAMIDS RANDOM COPOLYAMIDES | |
| The synthesis, thermal, and gas transport properties of poly(hexafluoroisopropylidene isophthalamide), HFA/ISO homopolymer, and HFA/TERT-co-HFA/ISO copolyamides with different poly(hexafluoroisopropilydene-5- t-butylisophthalamide), HFA/TERT, ratios are reported. The results indicate that the glass transition temperatures of the copolyamides increase as the concentration of HFA/TERT in the polyamide increases. The gas permeability coefficients in the polyamides and copolyamides are independent of pressure or decrease slightly particularly with CO2, N2, and CH 4. It was seen that HFA/TERT is 2-6 times more permeable than HFA/ISO, depending on the gas being considered. This was assigned to the presence of the bulky lateral substituent, t-butyl group in HFA/TERT and HFA/TERT-co-HFA/ISO copolyamides. This substituent increases fractional free-volume, as expected. Therefore, the gas permeability and diffusion coefficients generally increase with increasing fractional free-volume. The experimental results for the gas permeability and permselectivity for the copolyamides was well represented by a logarithmic mixing rule of the homopolyamides permeability coefficients and their volume fraction. The selectivity of gas pairs, such as O2/N2, CO 2/CH4, and N2/CH4 decreased slightly with the addition of HFA/TERT. The temperature dependence of permeability for homopolyamides and copolyamides can be described by an Arrhenius type equation. | |
| 2005 | |
| Artículo | |
| Journal of Polymer Science Part B: Polymer Physics, 43(19), 2625-2638, 2005 | |
| Inglés | |
| Carrera‐Figueiras, C., & Aguilar‐Vega, M. (2005). Gas permeability and selectivity of hexafluoroisopropylidene aromatic isophthalic copolyamides. Journal of Polymer Science Part B: Polymer Physics, 43(19), 2625-2638. | |
| INGENIERÍA Y TECNOLOGÍA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Artículos de Investigación Arbitrados |
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