Homogeneous Composite Nonwoven Support for High Temperature‐Resistant Separation Membranes

Abstract High temperature‐resistant separation membranes are widely considered in various fields. However, incompetent support layer limits the performance of high temperature‐resistant membranes severely. In this work, a homogeneous composite nonwoven support (HCNS) is developed by wet‐laid and hot‐pressing technology using undrawn polyethylene terephthalate fibers as bonding fibers. The significance of hot‐pressing parameters on the performances of the HCNS is investigated, and quadratic regression models are established. The HCNS exhibits a smooth surface (roughness of 118 nm) and a porous structure (porosity of 21.06% and pore size of 6.548 µm) with a mechanical property (tensile index of 45.80 N m g −1 ). The ultrafiltration membranes supported by the HCNS are prepared from poly(phthalazine ether sulfone ketone), which demonstrates high permeance, high rejection rate, and long‐term stability at raised operation temperature, thereby suggesting the potential application of HCNS in high‐temperature filtration.