THE FORMATION AND PROPERTIES OF A CLASS OF HIGHLY CONDENSED AROMATIC- HETEROCYCLIC POLYMERS
Technical rept. Jul 1965-Jun 1966
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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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 dLgm were not obtained. Analysis of both type polymers which had viscosities less than 1.0 dLgm 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.
- Polymer Chemistry