Milad Khoshkam - Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad
Morteza Sadeghi - Chemical Engineering Department, Isfahan University of Technology, Isfahan, Iran
Mehdi Pourafshari - Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad
M.j Namazifard - Chemical Engineering Department, Isfahan University of Technology, Isfahan, Iran

In the past decades membrane technology used for gas separations [1]. Polyimides exhibit excellent thermal stability, chemical resistance and mechanical strength. When they areused as a membrane material for gas separation, they have high gas selectivity, but low permeability, insolubility andinfusibility restrict their full potential. To overcome this limit, many efforts have been performed to modify the physical and chemical properties of polyimides, aimed at obtaining tractability and good gas separation performance membrane materials. Polyamide–imides are another class of potentiallyuseful gas separation materials [2]. These materials contain both an imide and amide linkage. Polyamide–imides have the potential to offer high plasticization resistance due to their ability to form interchain hydrogen bonds and charge transfer complexes (CTCs), making them attractive for aggressive, gas sweetening applications [3].