Thermally stable high-performance polymeric membranes

Polymeric membranes can be used for the energy-efficient and low-cost separation of liquids and gases. However, their inability to resist high temperatures limits their use in certain industries. Due to the high cost of inorganic membranes and their high tendency to irreversible fouling, numerous studies have been focused on modifying polymers to create temperature resistant polymeric membranes. Polymer scientists introduced many thermally stable polymers which exhibit enhanced thermal stability. However, the major problem with these polymers is their low processability, which is mainly due to their insolubility in the common solvents. So far, there has been little success in processing the high temperature resistant polymers to make membranes with acceptable permeation characteristics. The aim of this study is to review these efforts with focus on the main limitations and challenges during membrane preparation. The key factors discussed include the type of applied polymer, membrane preparation method, thermal analysis results and application of the prepared membranes.