Conjugate polymers provide the possibility of exploiting both the chemical and physical attributes of the polymers for membrane-based gas separation. The presence of delocalized π electrons provides high chain stiffness with low packing density, thus making the membrane a rigid structure that favors facilitated transport. Historically, the polymeric membranes were constrained by the tradeoff relationship between gas permeability and gas selectivity. So, different methods were investigated to prepare the membranes that can overcome the limitation. In recent years, electroconductive polymeric membranes have gained attention with their enhanced transportation properties combining the separation behavior depending on both molecular size discrimination as well as the facilitated transport. They offer better selectivity toward polar gases such as CO₂ because of the increased solubility. This review is aimed to provide a literature survey on gas separation using conjugate polymers such as polyaniline, polypyrrole, and some derivatives of polythiophenes. It contains various methods used by different researchers to enhance the gas separation properties of the membranes with improved mechanical and thermal stability such as changing the morphology and membrane preparation methods. In addition, it provides the pros and cons of various factors affecting the conjugate polymer membrane performance. The major challenges and future work that can be done in improving the transportation properties through the membrane to achieve viable membranes are also discussed so that they can be used for commercial and practical applications in the future.

共轭聚合物提供了利用聚合物的化学和物理属性进行基于膜的气体分离的可能性。离域 π 电子的存在提供了高链刚度和低堆积密度，从而使膜成为有利于促进运输的刚性结构。历史上，聚合物膜受到气体渗透性和气体选择性之间的权衡关系的限制。因此，研究了不同的方法来制备可以克服限制的膜。近年来，导电聚合物膜因其增强的传输特性而受到关注，结合取决于分子大小区分和促进传输的分离行为。它们对极性气体（如 CO）具有更好的选择性₂溶解度增加。本综述旨在提供有关使用共轭聚合物（如聚苯胺、聚吡咯和聚噻吩的一些衍生物）进行气体分离的文献综述。它包含不同研究人员使用的各种方法来增强膜的气体分离性能，并改善机械和热稳定性，例如改变形态和膜制备方法。此外，它还提供了影响共轭聚合物膜性能的各种因素的优缺点。还讨论了通过膜改善运输性能以实现可行膜方面的主要挑战和未来工作，以便它们在未来可用于商业和实际应用。