Phase segregation and gas separation properties of thermally treated copoly(ether-imide) from an Aromatic Dianhydride, an Aromatic Diamine, and Various Aliphatic Diamines / Alberto Tena in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3766–3775 Titre : Phase segregation and gas separation properties of thermally treated copoly(ether-imide) from an Aromatic Dianhydride, an Aromatic Diamine, and Various Aliphatic Diamines Type de document : texte imprimé Auteurs : Alberto Tena, Auteur ; Angel Marcos-Fernandez, Auteur ; Laura Palacio, Auteur Année de publication : 2012 Article en page(s) : pp. 3766–3775 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas Phase segregation processes Résumé : Copoly(ether-imide)s formed by the reaction of an aromatic dianhydride (BPDA), an aromatic diamine (ODA), and various aliphatic diamines (PEO-2000, PPO-2000, RT-1000, pTHF-1700, and pTHF-350) have been obtained. These copolymers underwent phase segregation processes, as confirmed by small-angle X-ray scattering (SAXS), when they were thermally treated. Gas permeabilities of these materials depended on the phase separation. Thus, a linear relationship between gas permeability and increasing percentage and size of the domains of the segregated phase has been obtained. The differences in the degree of segregation have been examined for the different aliphatic diamines used in the synthesis of the copolymers. The effect of polarity, length, and structure of the chain were examined in terms of permeability for the gases O2, N2, CO2, and CH4. It has been shown that long aliphatic chains with adequate polarity and the ability to interact with and enhance the condensation of a certain gas give better materials. Improved selectivities, approaching the Robeson limit, were seen as a consequence of the thermal treatment. Also, an interesting reverse selectivity has been observed for the mixture CH4/N2, probably due to a combined effect of a specific interaction and an increase in solubility of CH4 in the soft segregated portions of the copolymer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2028443 [article] Phase segregation and gas separation properties of thermally treated copoly(ether-imide) from an Aromatic Dianhydride, an Aromatic Diamine, and Various Aliphatic Diamines [texte imprimé] / Alberto Tena, Auteur ; Angel Marcos-Fernandez, Auteur ; Laura Palacio, Auteur . - 2012 . - pp. 3766–3775. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3766–3775 Mots-clés : Gas Phase segregation processes Résumé : Copoly(ether-imide)s formed by the reaction of an aromatic dianhydride (BPDA), an aromatic diamine (ODA), and various aliphatic diamines (PEO-2000, PPO-2000, RT-1000, pTHF-1700, and pTHF-350) have been obtained. These copolymers underwent phase segregation processes, as confirmed by small-angle X-ray scattering (SAXS), when they were thermally treated. Gas permeabilities of these materials depended on the phase separation. Thus, a linear relationship between gas permeability and increasing percentage and size of the domains of the segregated phase has been obtained. The differences in the degree of segregation have been examined for the different aliphatic diamines used in the synthesis of the copolymers. The effect of polarity, length, and structure of the chain were examined in terms of permeability for the gases O2, N2, CO2, and CH4. It has been shown that long aliphatic chains with adequate polarity and the ability to interact with and enhance the condensation of a certain gas give better materials. Improved selectivities, approaching the Robeson limit, were seen as a consequence of the thermal treatment. Also, an interesting reverse selectivity has been observed for the mixture CH4/N2, probably due to a combined effect of a specific interaction and an increase in solubility of CH4 in the soft segregated portions of the copolymer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2028443

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