Accession Number : ADD002372

Title :   2,2'-Bis(Phenylethynyl-5,5'-Diaminobenzidine.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Hedberg,Frederick L ; Arnold,Fred E

Report Date : 16 Mar 1976

Pagination or Media Count : 7

Abstract : Quinoxaline polymers are synthesized by solution polycondensation of 2,2'bis(phenylethynyl)-5,5'-diaminobenzidine with aromatic bis-benzils. Upon heating the polymers so prepared at a temperature ranging from about 240 to 300C, they undergo a thermal intramolecular cyclization reaction, thereby providing cured, thermally stable, highly fused quinoxaline composition. Because of their solubility in aprotic solvents and the mechanism whereby they are cured, the quinoxaline polymers are particularly suitable for use in high temperature applications such as in the fabrication of plastic composites and protective coatings.

Descriptors :   *Quinoxalines, *Synthesis(Chemistry), *Patents, Thermal stability, Plastics, Protective coatings, Polymers, Condensation reactions, Heat resistant plastics, Nitrogen heterocyclic compounds, Aryl ethers, Crosslinking(Chemistry), Monomers

Subject Categories : Polymer Chemistry
      Coatings, Colorants and Finishes
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE