| abstract |
Provided is a gas separation membrane which combines excellent gas permeability and gas separation characteristics, in particular, permeability to carbon dioxide (CO 2 ) and the property of separating carbon dioxide and methane (CH 4 ), on a high level which has not been attained hitherto.nA solution of a mixture comprising a linear hydroxypolyamic acid and a multibranched polyamic acid was used to produce a gas separation membrane constituted of a polymer blend comprising a linear hydroxypolyimide and a multibranched polyimide. |