THE FORMATION AND PROPERTIES OF A CLASS OF HIGHLY CONDENSED AROMATIC- HETEROCYCLIC POLYMERS
Abstract
Thermally stable polymers, the polybenzimidazobenzo phenanthrolines, were synthesized from 1,4,5,8-naphthalene tetracarboxylic acid (NTCA) and aromatic tetraamines. Polycondensations of NTCA with both 3,3'-diaminobenzidene (DAB) and 1,2,4,5-tetraaminobenzene tetrahydrochloride (TAB) in polyphosphoric acid gave soluble polymers which exhibited thermal stabilities near 600 C under nitrogen and near 500 C in air. Although these polycondensates were found to possess the highly fused benzimidazobenzo phenanthroline structure by infrared and elemental analysis, they are soluble in a few strong acids and bases. Polymers derived from DAB could be prepared which had intrinsic viscosities in the range of 1 to 2 in sulfuric acid, and these were found to be fiber forming. Low viscosity polymer from NTCA and DAB could also be prepared by solid phase polycondensation. The analogously structured ladder type polymer prepared from TAB had poorer solubility characteristics and solution viscosities greater than 1.0 dL/gm were not obtained. Analysis of both type polymers which had viscosities less than 1.0 dL/gm indicated the presence of some incompletely cyclized chain structure. It was possible to cause some advancement in the viscosities of polymers synthesized from DAB by secondary solid phase reactions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1967
- Accession Number
- AD0814615
Entities
People
- A. J. Sicree
- O. K. Goins
- R. L. Van Deusen
Organizations
- Air Force Research Laboratory