Polymers of intrinsic microporosity (PIMs) with high free volumes have been synthesized by incorporating contorted rigid moieties into polymers backbones. Despite their many appealing properties, membranes made of these polymers have not been used industrially because of their fast physical aging. The unprecedented CO₂ permeability and satisfactory CO₂/N₂ and CO₂/CH₄ selectivity of PIMs have led to establishing the new 2019 upper bounds for the gas mixtures. This article reviews recent advances in the field of PIM-based membranes. It discusses polymer synthesis strategies to modify PIM structures such that the resulting membranes have improved CO₂ separation performance and lower physical aging. The strategies include the use of monomers with suitable side chains, kinked moieties, and stable structures.

通过将扭曲的刚性部分结合到聚合物主链中，合成了具有高自由体积的本征微孔度（PIM）聚合物。尽管具有许多吸引人的特性，但是由这些聚合物制成的膜由于其快速的物理老化而尚未在工业上使用。PIM具有前所未有的CO ₂渗透性和令人满意的CO ₂ / N ₂和CO ₂ / CH ₄选择性，从而为混合气体确定了2019年的新上限。本文回顾了基于PIM的膜领域的最新进展。它讨论了聚合物合成策略，以修改PIM结构，使所得的膜具有改善的CO ₂分离性能和较低的物理老化。这些策略包括使用具有合适侧链，扭结部分和稳定结构的单体。