发明名称 |
Poly(N-arylenebenzimidazole)s via aromatic nucleophilic displacement |
摘要 |
Novel poly(N-arylenebenzimidazole)s (PNABls) are prepared by the aromatic nucleophilic displacement reaction of novel di(hydroxyphenyl-N-arylene benzimidazole) monomers with activated aromatic dihalides or activated aromatic dinitro compounds. The polymerizations are carried out in polar aprotic solvents such as N-methyl-2-pyrrolidinone or N,N-dimethylacetamide using alkali metal bases such as potassium carbonate at elevated temperatures under nitrogen. The di(hydroxyphenyl-N-arylenebenzimidazole) monomers are synthesized by reacting phenyl-4-hydroxybenzoate with bis(2-aminoanilino)arylenes in diphenylsulfone. Moderate molecular weight PNABIs of new chemical structures were prepared that exhibit a favorable combination of physical and mechanical properties. The use of the novel di(hydroxyphenyI-N-arylenebenzimidazole)s permits a more economical and easier way to prepare PNABIs than previous routes.
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申请公布号 |
US5554715(A) |
申请公布日期 |
1996.09.10 |
申请号 |
US19950375334 |
申请日期 |
1995.01.17 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF NATIONAL AERONAUTICS AND SPACE ADMINISTRATION |
发明人 |
CONNELL, JOHN W.;HERGENROTHER, PAUL M.;SMITH, JR., JOSEPH G. |
分类号 |
C08G73/18;(IPC1-7):C08G73/18 |
主分类号 |
C08G73/18 |
代理机构 |
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