PBI films formed without use of organic solvents
AssigneeUniversity of South Carolina
InventorsLaura A. Murdock, Lihui Wang, Fei Huang, Brian C. Benicewicz
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Abstract
A novel process for making PBI films starting from gel PBI membranes polymerized and casted in the PPA process wherein acid-imbibed gel PBIs are neutralized in a series of water baths and undergo controlled drying in association with a substrate material, yielding a PBI film without the use of organic solvents.
Claims15
A dried polybenzimidazole (PBI) film exhibiting a tensile stress at break of at least 25 MPa and a VOSO4 permeability of from 2.6×10−9 cm2/s to 4.89×10−7 cm2/s, wherein the dried PBI film includes a crosslinked polybenzimidazole that includes one or more of the following repeating units:
Dependencies are inferred from the claim text.