Polybenzimidazole via aromatic nucleophilic displacement
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsJohn W. Connell, Paul M. Hergenrother, Joseph G. Smith
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Abstract
Di(hydroxyphenyl)benzimidazole monomers were prepared from phenyl-4-hydroxybenzoate and aromatic bis(o-diamine)s. These monomers were used in the synthesis of soluble polybenzimidazoles. The reaction involved the aromatic nucleophilic displacement of various di(hydroxyphenyl)benzimidazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds in the presence of an alkali metal base. These polymers exhibited lower glass transition temperatures, improved solubility, and better compression moldability over their commercial counterparts.
Claims9
A soluble polybenzimidazole having the following structural repeat unit:
- ##STR26## where:
- the catenation of oxygen is selected from the group consisting of:
- meta-meta, para-para, and para-meta;
- Ar is selected from the group consisting of:
- ##STR27## x is selected from the group consisting of:
- ##STR28##
Dependencies are inferred from the claim text.