Accession Number : AD0726471

Title :   Research into the Formation Kinetics of Polypyromellitimide by IR Absorption Spectroscopy,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s) : Laius,L. A. ; Bessonov,M. I. ; Kallistova,E. V. ; Adrova,N. A. ; Florinskii,F. S.

Report Date : JUL 1971

Pagination or Media Count : 20

Abstract : Aromatic polyimides are produced in a two-stage condensation polymerization reaction of the dianhydrides of the aromatic tetracarboxylic acid with the aromatic diamines. The first stage of the reaction is usually carried out in a strongly polar solvent at room temperature and produces a solution of polyamic acid. The second reaction stage, the imidization, consists of a chemical, or thermal, treatment of the polyamic acid that had been precipitated from the solution. In the present work, the kinetics of the thermally induced imidization of a film of polypyromellitanic acid produced from the dianhydride of the pyromellitic acid and a diaminodiphenyl ether were investigated using IR absorption spectroscopy. (Author)

Descriptors :   (*CARBOXYLIC ACIDS, *POLYMERIZATION), (*INFRARED SPECTROSCOPY, POLYMERIZATION), MOLECULAR ASSOCIATION, REACTION KINETICS, IMIDES, PLASTIC COATINGS, ANHYDRIDES, AMINES, USSR

Subject Categories : Polymer Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE