Accession Number : AD0779491

Title :   Heat Stable Polyquinoxalines. Heat Stable Polymers: Polyphenylene and Other Aromatic Polymers.

Descriptive Note : Final rept. Jan 65-Dec 70,


Personal Author(s) : Stille,John K.

Report Date : 01 APR 1974

Pagination or Media Count : 45

Abstract : Linear thermally stable polyquinoxalines have been prepared by the reactions of combinations of three tetraamines, with two bisglyoxals. All the polyquinoxalines have excellent thermal stability both in nitrogen and in air. Ladder quinoxaline polymers were prepared by the condensation of aromatic tetraamines or tetraketones. All of the polymers obtained were completely soluble in 1,3-dichloro-1,1,3,3-tetrafluoro-2,2-dihydroxypropane. The thermal stability of the ladder polymers in a nitrogen atmosphere was considerably greater than that of the corresponding single-strand polymer. The Diels-Alder reaction of cyclopentadienones or alpha-pyrones with acetylene dienophiles provides a unique and unequivocal method of synthesis of polyphenylenes. High molecular weight (60-100,000) phenylated polyphenylenes and poly(p-phenylene) can be obtained from this reaction. The Diels-Alder homopolycycloaddition of 2,5-diphenyl-3,4-(5,6-acenaphthylenylene)cyclopentadienone afforded a low molecular weight soluble ladder polymer. (Modified author abstract)

Descriptors :   *Heat resistant plastics, *Aromatic compounds, Polymers, Synthesis(Chemistry), Thermal stability, Polymerization, Solubility

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE