Accession Number : ADA310394

Title :   An Exploratory Study of a New Class of Stepladder and Ladder Polymers-Polyimidazopyrrolones.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Pezdirtz, George F. ; Bell, Vernon L.

PDF Url : ADA310394

Report Date : DEC 1965

Pagination or Media Count : 22

Abstract : A new class of aromatic-heterocyclic polymers has been discovered. These were prepared from the room-temperature reaction of tetraamines with tetraacids or their respective derivatives. This new class of polymers is polyimidazopyrrolones or 'Pyrrones.' Exploratory experiments indicate that they have excellent thermal and radiolytic stability and hold considerable potential for aerospace as well as highly specialized terrestrial applications. The chemical structure of the Pyrrones combines the structures of the aromatic polyimides and polybenzimidazoles. Since they are formed through an intermediate stage which is soluble, typical solution property measurements can be used for basic molecular characterization. Knowledge of the molecular properties of the soluble intermediate reflect on the molecular character of the final insoluble Pyrrones. A reaction scheme for the conversion of the soluble intermediate is presented. Applied properties such as ease of fabrication, mechanical strength, and molding characteristics are discussed.

Descriptors :   *POLYMERS, *IMIDAZOLES, MOLECULES, HIGH TEMPERATURE, THERMAL STABILITY, STRENGTH(MECHANICS), ROOM TEMPERATURE, AMINES, SOLUTIONS(GENERAL), MOLECULAR STRUCTURE, AROMATIC COMPOUNDS, MOLDINGS, MOLECULAR PROPERTIES, ACIDS, HETEROCYCLIC COMPOUNDS, RADIOLYSIS, POLYIMIDE RESINS, POLYBENZIMIDAZOLE.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Laminates and Composite Materials
      Atomic and Molecular Physics and Spectroscopy
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE