Nanotechnological method to control pore diameter of organic–inorganic composite membrane: Part II. Molecular-wise vapor polymerization (MVP)

Polyimide-alumina composite membranes were fabricated by the molecular-wise vapor polymerization (MVP) technique of copolymer which has a constant repeating unit chemically bound by primer on the wall and/or surface of the porous ceramic support. By changing the flow rate of N2 carrier gas and the repeating number (n), the fabricated pyromellitic dianhydride (PMDA)–diaminodiphenylether (ODA) composite membranes have separation factor αCO2/CH4 in the range 0.87–16.0. The estimation of pore diameter was carried out by N2 permeance and estimated pore diameter was controlled in the range 38–263 nm.