Gas separation properties of aromatic polyimides

A series of aromatic polyimides have been investigated for their permeation properties to oxygen, nitrogen, helium, carbon dioxide and methane. The polymers are soluble, film-forming polyimides based on new anhydride monomers containing carbonyl groups as connecting linkages of phenyl rings and bulk...

Full description

Saved in:
Bibliographic Details
Published inJournal of membrane science Vol. 215; no. 1; pp. 61 - 73
Main Authors Ayala, D, Lozano, A.E, de Abajo, J, Garcı́a-Perez, C, de la Campa, J.G, Peinemann, K.-V, Freeman, B.D, Prabhakar, R
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.04.2003
Subjects
Aromatic polyimides
Gas separation
Molecular modeling
Gas separation
Molecular modeling
Aromatic polyimides
Online AccessGet full text

Cover

More Information
Summary:A series of aromatic polyimides have been investigated for their permeation properties to oxygen, nitrogen, helium, carbon dioxide and methane. The polymers are soluble, film-forming polyimides based on new anhydride monomers containing carbonyl groups as connecting linkages of phenyl rings and bulky side groups like phenyl and t-butyl. To assist in explaining the experimental results, molecular modeling was performed to calculate density, free volume and chain parameters that could account for the behavior of the polymers as selective barriers for gas penetrants. High values of O 2/N 2 selectivity and good permeabilites were observed for some polymers; their properties lie near the upper bound for this gas pair. Gas permeability typically increased with increasing free volume, and, in general, free volume could be related to the chemical composition of the polymer backbone and to the nature of the pendent groups.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(02)00602-6