| 초록 |
We demonstrate that polymers with an intermediate cavity size, a narrow cavity size distribution and a shape reminiscent of bottlenecks connecting adjacent chambers, such as those found elegantly in Nature in the form of ion channels and aquaporins, yield both high permeability and high selectivity. For this purpose, aromatic polymers interconnected with heterocyclic rings (e.g., benzoxazole, benzithiazole, polypyrrolone and benzimidazole) are of interest because phenylene-heterocyclic ring units in such materials have a flat, rigid-rod structure with high torsional energy barriers to rotation between two rings. Most of all, the greatest benefit of these Thermally Rearranged (TR) polymers is the ability to tune the cavity size and distribution for specific gas applications including CO2 from flue gas by using various templating molecules and heat treatments, using one starting material. |
