Polymer membrane-based gas separation is a superior economical and energy-efficient separation technique over other conventional separation methods. Over the years, different classes of polymers are investigated for their membrane-based applications. The need to search for new polymers for membrane-based applications has been a continuous research challenge. Aromatic polyamides (PAs), a type of high-performance materials, are known for their high thermal and mechanical stability and excellent film-forming ability. However, their insolubility and processing difficulty impede their growth in membrane-based applications. In this review, we will focus on the PAs that are investigated for membrane-based gas separations applications. We will also address the polymer design principal and its effects on the polymer solubility and its gas separation properties. Accordingly, some of the aromatic PAs developed in the authors’ laboratory that showed significant improvement in the gas separation efficiency and placed them in the 2008 Robeson upper bound are also included in this review. This review will serve as a guide to the future design of PA membranes for gas separations.

中文翻译：

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用于气体分离的芳族聚酰胺无孔膜

与其他常规分离方法相比，基于聚合物膜的气体分离是一种经济，节能的卓越分离技术。多年来，针对基于膜的应用研究了不同种类的聚合物。对于基于膜的应用寻找新的聚合物的需求一直是持续的研究挑战。芳香族聚酰胺（PAs）是一种高性能材料，以其高的热稳定性和机械稳定性以及出色的成膜能力而著称。但是，它们的不溶性和加工困难性阻碍了它们在基于膜的应用中的增长。在本文中，我们将重点介绍针对膜式气体分离应用进行研究的PA。我们还将介绍聚合物的设计原理及其对聚合物溶解度及其气体分离性能的影响。因此，作者实验室中开发的一些芳香族PA表现出气体分离效率的显着改善，并将其置于2008年Robeson上限内，也包含在本评价中。这项审查将作为未来用于气体分离的PA膜设计的指南。