Carbon Molecular Sieve Membranes Derived from Tröger's Base‐Based Microporous Polyimide for Gas Separation

Abstract Carbon molecular sieve (CMS)‐based membranes have attracted great attention because of their outstanding gas‐separation performance. The polymer precursor is a key point for the preparation of high‐performance CMS membranes. In this work, a microporous polyimide precursor containing a Tröger's base unit was used for the first time to prepare CMS membranes. By optimizing the pyrolysis procedure and the soaking temperature, three TB–CMS membranes were obtained. Gas‐permeation tests revealed that the comprehensive gas‐separation performance of the TB–CMS membranes was greatly enhanced relative to that of most state‐of‐the‐art CMS membranes derived from polyimides reported so far.