NEW SYNTHESES OF POLYBENZIMIDAZOLES,
Abstract
Polybenzimidazoles were synthesized from adipamide dihydrochloride, diethyl diiminoadipate dihydrochloride and 3,3' -diaminiobenzidine, and also from adiponitrile and 3,3' -diaminobenzidine tetrahydrochloride both in melt and in N-methylphrolidinone solution. The melting temperatures and the solubilities of poly prepared by these methods approached those of polybenzimidazoles of a similar structure prepared from diphenyl adipate and 3,3' -diamino-benzidine. The polymers are light-brown powders soluble in sulfuric and formic acids, dimethylformamide, dimethylsulfoxide, dimethylacetamide, and other solvents. The reduced viscosity of 0.5 percent solution of the polymers in formic acid at 25 degrees C was 0.5 dl/g. The structure of the polymer was confirmed by IR-spectroscopy and elemental analysis. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 09, 1969
- Accession Number
- AD0691653
Entities
People
- S. V. Vinogradova
- V. A. Pankratov
- V. V. Korshak
Organizations
- National Air and Space Intelligence Center