GAS SEPARATION MEMBRANE

摘要

A gas separation membrane, comprising a film with a thickness ranging from 0.05-10-6 to 20.10-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which corresponds to the following formula (I): <IMAGE> (I) where A represents a tetravalent aromatic radical or a mixture of tetravalent aromatic radicals, and B represents a bivalent aromatic radical at least 50% by mole of which has the following formula (II): <IMAGE> (II) formula (I) being differnt from the following formula (III): <IMAGE> (III)