(380j) Gas Separation Characteristics between Freestanding Film and Thin Film Composite Membrane Using Fluorinated Polyimide

Gas separation membranes play a crucial role in various industrial applications ranging from hydrogen purification to petroleum refining. For practical aspects, it is essential to reduce the thickness of the separation layer to the nanometer level and to supplement the mechanical strength. Thus, hollow fiber-based thin film composite (HF-TFC) membranes have garnered significant attention due to relatively easy to fabricate membrane module configuration. However, the HF-TFC membranes generally suffer from lower gas separation properties including permeability and selectivity than the freestanding film. Here we describe the gas transport characteristics between the freestanding film and HF-TFC membrane using fluorinated polyimide (fPI). The fPI serves as a model material for understanding the fundamental principles governing gas permeation between both configurations. We employ advanced automatic coating techniques to minimize sample-to-sample variation. By systematically varying parameters such as membrane thickness, morphology, and polymer composition, we aim to optimize the gas separation performance of the membranes. Detailed will be shown in this presentation.