Accession Number : ADD000757
Title : Thermally Stable, Highly Fused Quinoxaline Composition and Method of Synthesis.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C
Personal Author(s) : Hedberg,Frederick ; Arnold,Fred E
Report Date : 08 Apr 1975
Pagination or Media Count : 9
Abstract : The patent concerns the synthesis of quinoxaline polymers 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 compositions. Because of their solubility in aprotic solvents and the mechanism whereby they are cured, the quinoxaline polymer are particularly suitable for use in high temperature applications such as in the fabrication of plastic composites and protective coatings.
Descriptors : *Patents, *Heat resistant plastics, Condensation reactions, Synthesis(Chemistry), Molecular structure, Curing
Subject Categories : Organic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE