OICC Press Journal of Nanostructure in Chemistry 2193-8865 8 4 (December 2018) 2018 08 19 Synthesis and characterization of brominated poly(2,6-diphenyl-p-phenylene oxide)/SiO2 nanocomposite membrane for CO2/N2 separation 10.1007/s40097-018-0274-5 EN Hojjat Ghanbarian Department of Science, South Tehran Branch, Islamic Azad University, Tehran, IR Behrooz Mirza Department of Chemistry, Karaj Branch, Islamic Azad University, Karaj, IR Journal Article 2018 08 19 Abstract Synthesized poly(2,6-diphenyl- p -phenylene oxide) (PPPO dp ) and brominated poly(2,6-diphenyl- p -phenylene oxide) (BPPPO dp ) are identified as new membranes for CO 2 /N 2 separation and characterized by SEM, FTIR, and 1 HNMR. BPPPO dp is known as a flexible membrane with higher permselectivity ( αCO2/N2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\alpha_{{{\text{CO}}_{ 2} / {\text{N}}_{ 2} }}$$\end{document}  = 30.53) than PPPO dp membranes. BPPPO and SiO 2 nanocomposite membranes display improved CO 2 permeability and CO 2 /N 2 selectivity compared to the pure PPPO dp , and BPPPO dp membranes. The CO 2 /N 2 separation mechanism in the membranes is related to the amount of gas dissolution than the amount of gas diffusion. Graphical abstract