Claims
- 1. 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##
- 2. A soluble polybenzimidazole of claim 1, having the following structural repeat unit: ##STR29## where x is selected from the group consisting of: ##STR30##
- 3. A soluble polybenzimidazole of claim 1, having the following structural repeat unit: ##STR31## where x is selected from the group consisting of: ##STR32##
- 4. A soluble polybenzimidazole of claim 1, having the following structural repeat unit: ##STR33## where x is selected from the group consisting of: ##STR34##
- 5. A film prepared from the polybenzimidazole of claim 1.
- 6. A process to prepare the soluble polybenzimidazole of claim 1, comprising the steps of:
- a. forming a mixture comprising a di(hydroxyphenyl)benzimidazole monomer, an activated aromatic dihalide compound, an alkali metal base selected from the group consisting of: potassium carbonate, sodium carbonate, potassium hydroxide, and sodium hydroxide; and a solvent selected from the group consisting of: N,N-dimethylacetamide, N-methyl-pyrrolidinone, diphenylsulfone, and sulfolane.
- b. heating the mixture to about 150.degree.-200.degree. C.; and
- c. recovering the polymer product.
- 7. The process of claim 6, wherein said alkali metal base is potassium carbonate.
- 8. The process of claim 6, wherein the dihalide compound contains a halogen selected from the group consisting of: chlorine and fluorine.
- 9. A process to prepare the soluble polybenzimidazole of claim 1, comprising the steps of:
- a. forming a mixture comprising a di(hydroxyphenyl)benzimidazole monomer, an activated aromatic dinitro compound, an alkali metal base selected from the group consisting of: potassium carbonate, sodium carbonate, potassium hydroxide, and sodium hydroxide; and a solvent selected from the group consisting of: N,N-dimethylacetamide, N-methyl-pyrrolidinone, diphenylsulfone, and sulfolane.
- b. heating the mixture to about 150.degree.-200.degree. C.; and
- c. recovering the polymer product.
ORIGIN OF THE INVENTION
The invention described herein was jointly made by employees of the U.S. Government and a contract employee in the performance of work under NASA Grant No. NAG1-448 and is subject to the provisions of Public Law 96-517 (35 USC 202) in which the contractor has elected not to retain title.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5039778 |
Dang et al. |
Aug 1991 |
|