Fabrication of microporous PBI membranes with narrow pore size distribution

摘要

A microporous polybenzimidazole membrane having a uniform pore structure and a narrow pore size distribution, and a process for making the membrane. The process requires coating a polybenzimidazole powder with a high temperature stable polymer and compression molding the coated particles at a temperature in the approximate range of 435-450. degree. C. to form a sheet or membrane. The polymer is then extracted from the sheet, leaving a fine, uniform, polybenzimidazole microporous structure.